Air-Cooled Rotary Screw Chillers

Product Manual PM ALS-2

Group: Chiller

Date: October 1999

Supersedes: PM ALS-1

© 1998 McQuay International

Air-Cooled Rotary Screw Chillers

ALS 125B to ALS 425B125 to 425 Tons, 420 to 1500 kW60 Hz, R-22

2 ALS 125B - 425B Product Manual ALS-2

Table of Contents

Introduction...................................................................................................................4

Customer Benefits..........................................................................................................5

Design Advantages.........................................................................................................8

Controls.......................................................................................................................10

Selection Procedures....................................................................................................13

Application Adjustment Factors....................................................................................15

Performance Data ........................................................................................................17

Part Load Data ............................................................................................................23

Pressure Drop..............................................................................................................24

Sound Data..................................................................................................................26

Electrical Data..............................................................................................................30

Field Wiring Diagram....................................................................................................45

Physical Data...............................................................................................................46

Dimensions, ALS .........................................................................................................51

Installation and Application...........................................................................................55

Electrical Connections ..................................................................................................59

Remote Evaporator......................................................................................................60

Dimensions, Remote Evaporator...................................................................................68

Standard Features........................................................................................................72

Optional Features.........................................................................................................74

Specifications...............................................................................................................76

"McQuay" is a registered trademark of McQuay International1997 McQuay International

Our facility is ISO9002 Certified

Product Manual ALS-2 ALS 125B - 425B 3

"Illustrations cover the general appearance of McQuay International products at the time of publicationand we reserve the right to make changes in design and construction at anytime without notice"


Introduction

The McQuay ALS air-cooled chillers are equipped with McQuay single-rotor,liquid-injected, screw compressors, high efficiency lanced condenser fins, multi-circuit DX evaporator and fuzzy logic MicroTech control theory to offer the utmostin quiet and efficient operation.

UNSURPASSED EFFICIENCY• Single-screw compressor design

• Electronic expansion valve control

• Built-in economizer design

• High efficiency lanced condenser fins

QUIET OPERATION• Tuned discharge chamber

• Composite gaterotor material

• Liquid refrigerant-cooled motor

• Virtually vibration-free operation

OUTSTANDING RELIABILITY• Rugged compressor design

• Low thrust loads on bearings

• Advanced composite gaterotor material

• Liquid refrigerant-cooled motors

• Multiple compressors with…

• Independent refrigerant circuits

• Proactive control logic

• Full factory run-testing assures trouble-free operation

• McQuayService start-up

SUPERIOR CONTROL LOGIC• Precise control and improved efficiency with fuzzy logic

• Easy to read two-line by 40-character LCD display

• Remote PC monitoring capability

• Open Protocol with virtually all BMS

• Superior reliability under extreme operating conditions


Customer Benefits

Unsurpassed efficiency• Zero clearance fit between the two gaterotors and main screw rotor virtually eliminates

leakage between the high and low pressure sides during compression. Special gaterotormaterial made from multiple layers of an advanced composite, temperature stablematerial makes a zero clearance design possible.

• An internal economizer system enhances the unit's refrigeration effect providing moreBTUs per pound of refrigerant circulated. The result is higher efficiency and loweroperating costs when compared to typical chillers without economizers.

• The ALS screw compressors utilize a liquid refrigerant injection system, meaning only afraction of the oil is required when compared to oil injection systems. Oil drag that isfound in oil injected compressors has been eliminated. Less power is required to drivethe compression components (rotors) resulting in a more efficient unit.

• With the liquid injection design, the refrigerant vapor entering the condenser is at asaturated condition; no desuperheating takes place. This allows the condenser to be fullyutilized for condensing and operate more efficiently.

• The ALS air-cooled chiller is equipped with the most advanced means of refrigerantflow control available. An electronic expansion valve coupled with MicroTech fuzzylogic control provides excellent operating efficiencies both at full and part load operation.

Figure 1, StarGate Compressor Cutaway


Outstanding Reliability Features• Full factory testing of the unit with water hookups insures a trouble-free start-up.

Extensive quality control checks during testing insures that each safety and operatingcontrol is properly adjusted and operates correctly. Factory installed options minimizesfield expenses and startup labor.

• The rugged design of the single-screw compressor with its compliant gaterotors allows itto tolerate liquid slugging. The ALS screw chiller will start and operate under conditionsthat would destroy a reciprocating compressor.

• The elimination of many moving parts such as pistons, valves, connecting rods and oilpumps found on reciprocating compressors results in the enhanced reliability of thesingle-screw compressor.

• Due to symmetrical compression taking place on both sides of the main screw rotor,balanced forces result in the elimination of the large thrust loads inherent in twin-screwcompressors. Very low loading enhances the bearing and compressor durability andreliability.

• The liquid refrigerant injection design increases compressor reliability, as no large andexpensive oil separators are required. Recurring problems associated with oil injectionsystems are a thing of the past.

• Integral to the basic design of the single-screw compressor, the main screw rotor shaftand the gaterotor shafts cross at right angles in the compressor. The result is amplespace to locate heavy duty bearings and increase compressor reliability since nolimitations are placed on bearing design as found in twin-screw compressors.

• The compressor motor on the ALS screw chiller is liquid refrigerant cooled, allowingmotor operation at lower temperatures, enhancing system reliability and motor life whencompared to suction or discharge gas cooled designs.

• Recent technological advancements have made available a composite material thatprevents premature wear on the gaterotor. The composite material is made from amulti-layer carbon impregnated material designed for strength, temperature stability, anddurability.

Unmatched Serviceability• Field serviceability has not been sacrificed to meet design objectives for performance on

the ALS screw chiller. Inspection covers allow for an excellent visual inspection of themain screw and gaterotors.

• Compressors are located on the outside edges of the base allowing them to be easilyremoved from within the unit. This inherent unit design allows for quick access to thecompressors if necessary.

• Carefully laid-out refrigerant piping and components allow for excellent serviceability ofthe unit.


MicroTech , The Ultimate Control System• A fuzzy logic control system is employed in the ALS screw chiller that optimizes the

suction line superheat and the positioning of the electronic expansion valve at allcompressor capacities resulting in maximized operating efficiencies. Fuzzy logic controlis based on approximate reasoning that maintains tighter control of the system.

• The MicroTech chiller controller, already proven superior to all other chiller controlsystems on reciprocating and centrifugal chillers, is employed in the ALS screw chiller.This advanced microprocessor-based control maintains a precise and stable leavingevaporator temperature set point. Utilization of fuzzy logic means compressor cycling isminimized, reducing wear on both compressor and starting components.

• Stand-alone unit controls designed with the system operator in mind provide access tothe temperatures, pressures, set points, operating states, schedules, and alarm messages.The MicroTech controller includes password protection to guard against unauthorized oraccidental setpoint or parameter changes.

• Complete instrumentation with state of the art pressure transducers, temperature sensorsand optical liquid sensors for unparalleled operator information and diagnostics.

• Superior head pressure control that maximizes unit efficiency by determining optimumcondenser fan operation. At least 5 and as many as 7 stages of heat rejection per circuitare provided.

• An optional Remote Monitoring and Sequencing (RMS) panel provides monitoring andcontrol of remote chillers via a single twisted pair of wires. The RMS panel allows theuser to access information such as unit status, temperatures and pressures, all control setpoints, alarm conditions, time and date of alarm conditions, as well as the ability to clearalarms remotely. Up to three chillers can be sequenced and monitored from one RMSpanel.

• A personal computer equipped with optional MicroTech Monitor software can be used toprovide a high-level interface with the MicroTech controller. It can be connected to thecontroller either directly or remotely via phone lines with an optional modem.

• The optional MicroTech Network Master Panel (NMP) allows multiple screw chillercontrollers to be incorporated into a building-wide network with other MicroTech unitand auxiliary controllers. In conjunction with a personal computer, it provides thebuilding operator with the capability to perform advanced equipment control andmonitoring from a central or remote location.

• Open Protocol is a commitment from McQuay International to provide a cost effectivemeans to building automation through a strategic and joint effort with major temperaturecontrol companies. This optional feature provides an interface between one or multipleMicroTech controllers and the building automation system. The result is reducedinstallation costs, greater reliability and a seamless operator interface with all equipmentin the building.


Design Advantages

Ultra-low Sound LevelsThe issue of objectionable sound or "noise" can no longer be treated lightly as manufacturersmay have done in the past. To an owner, sound levels can be as important as unit efficiencyand must be addressed prior to the start of any development program. Concentrated effortsto design the quietest air-cooled chiller in the market has paid off with the ALS chiller line.Unique compressor and system design allow the ALS air-cooled chiller to produce soundlevels considerably lower than competitive reciprocating and twin-screw compressor units inthe market today.

The gaterotor material is manufactured from advanced engineered composite, and thedifference in material density and coefficient of elasticity from the main screw rotor reducesnoise levels through the compression chamber. The discharge housing is designed as a"tuned sound attenuator" to cancel out any noise pulsation. The liquid refrigerant injectiondesign eliminates the need for large oil separators that have traditionally transmittedunacceptable noise. Also, the liquid refrigerant that is used for liquid injection attenuatessound levels within the compressor.

Balanced Forces on CompressorThe single-screw compressor has a well-balanced compression mechanism which cancelsthe screw rotor load in both the radial and axial directions. Inherent to the basic single-screw compressor design is the virtually load free operation that gives main bearings adesign life 3-4 times greater than twin-screws, and eliminates expensive and complicatedthrust balancing schemes. The two exactly opposed gaterotors create two exactly opposedcompression cycles. Compression is made at the lower and upper parts of the screw rotorat the same time, thus canceling the radial loads. Also, both ends of the screw rotor aresubjected to suction pressure only, which cancels the axial loads and eliminates the hugethrust loads inherent in twin-screw compressors.

Figure 2, Balanced Forces

Reliable Bearing DesignSince the main rotor shaft and gaterotor shafts cross at right angles in the single-screwcompressor, sufficient space to locate each bearing is obtained. Because of this unique


characteristic for the single-screw compressor, bearing life can be designed much highercompared to twin-screws.

Liquid Refrigerant Injection SystemAll screw compressors require a fluid to be injected into the compression area for theremoval of heat and to seal potential leakage paths. The McQuay ALS screw chilleremploys a liquid refrigerant injection system that increases compressor reliability since nolarge and expensive oil separators are required as found on oil injected compressors.

Oil injection systems result in a relatively large percentage of oil in the discharge gas. If notproperly managed, this oil flows through the refrigerant circuit decreasing performance ofthe heat exchangers as oil builds up in the system. To prevent heat exchanger performancedegradation, auxiliary equipment such as an oil pump, oil heater, oil cooler and a highperformance oil separator at the compressor discharge section may be required. In somecases, an oil scavenger system must also be employed to return oil to the compressor.

On the McQuay ALS screw chiller with the liquid refrigerant injection system, a portion ofthe subcooled liquid refrigerant from the condenser is injected into the screw rotor grooves.This provides an effective seal for compression, assures low discharge temperatures, andeliminates the need for expensive or unreliable equipment for oil extraction and control. Thiskeeps the devices around the compressor simple, dependable and compact.

Tolerant of Liquid ReturnTolerance to liquid return is provided by the heavy construction of the screw components andby McQuay's Compliant Gate feature. Should any liquid start to enter the main rotor, thebuild up of pressure immediately causes the gate rotor to rise off the main rotor againstspring pressure. This relieves the refrigerant pressure and the refrigerant is pumped out.When the refrigerant has been discharged, the spring returns the gaterotor returns to itsnormal position. As a matter of fact, the ALS single-screw compressor is designed to workwith liquid refrigerant all the time because of the sealing requirements. This increasessystem reliability because it permits normal operation under abnormal conditions that wouldbe catastrophic (liquid return) for many other compressor designs.

Economizer DesignThe ALS screw compressorincorporates an integraleconomizer where centrifugalforce is utilized to separate theflash gas from the liquidrefrigerant prior to it entering theevaporator. A small centrifugalliquid/vapor separator mountedon the rear of the compressorshaft achieves the separation.The economizer itself is withinthe envelope of the standardmotor housing.


Low Vibration LevelsThe extremely low vibration levels, inherent with the single-screw design, will not passthrough system piping and allow objectionable resonated sound to be carried into the building.

Because the moving components in the McQuay ALS screw compressor are purelyrotational, the dynamic forces and vibration created by the system are very low. Thisreduced vibration results in less movement to refrigerant lines and other parts of the system.The vibration level will not exceed 0.14 in/sec (3.56 mm/sec).

Liquid Refrigerant-Cooled MotorThe compressor motor for the ALS screw chiller is liquid-refrigerant cooled. The liquidrefrigerant allows the motor to operate at lower temperatures and enhances system reliabilityand motor life when compared to suction gas-cooled designs found on twin-screw orcompetitor's reciprocating compressors.

Wide Application RangeThe capability to handle wide application ranges makes the ALS screw chiller a superiorchoice for comfort cooling, ice storage, and process applications. McQuay International hasbeen a proven leader in chiller applications and once again has developed a line of chillersunsurpassed in performance and quality.

Controls

MicroTech Controller Utilizing Fuzzy LogicMcQuay International has combinedmicroprocessor power and versatilityand our extensive experience in chillerdesign to create the MicroTech screwchiller controller utilizing a fuzzy logiccontrol system. The MicroTech controlprovides low maintenance, highperformance and energy efficientoperation that is so vital to profitablebuilding operation in the economicclimate of the 90s.

Fuzzy Logic ControlTraditional control systems on today's chillers do not adequately provide precisiontemperature control of the system. McQuay International has implemented an advanceddigital control method based upon fuzzy logic that maintains tighter and more stable control ofthe chiller system.

Conventional control logic operates on the true/false, black and white theory. However, inpractical applications everything is not black and white, but rather can be found somewherein between as shades of gray. Terms such as hot and cold in conventional controltechniques are replaced by ambiguous words like warm and cool. Fuzzy logic does notmaintain that a statement has to be true or false, but instead measures the degree of truth


within the statement and begins to take action immediately. Unlike traditional controllers thatrely on a linear control theory, the fuzzy logic based system is based upon approximatereasoning with a set of fuzzy rules. Fuzzy rules are "if-then" statements with varyingdegrees of precision.

A simple analogy of a "if-then" statement could be a car in traffic. If the distance betweentwo cars is adequate, then the car behind will continue at the same speed. If the distancebetween the two cars increases, then the car in the rear can accelerate slowly. If thedistance between the two cars is reduced slightly, then the car behind brakes slowly. If thedistance between them is reduced quickly, then the car in the rear must brake much morequickly. Fuzzy logic operates on this same principle.

The MicroTech controller supplied on the ALS chillers utilizes fuzzy logic in the control ofsuction line superheat and the positioning of the electronic expansion valve in response tosystem load. Expansion valve hunting, not uncommon on traditional thermostatic expansionvalves, has been eliminated. Optimized superheat is maintained under all conditions providingexcellent control.

Proactive ControlThe Microtech Control continuously monitors all important system parameters and will takepreventative measures to avoid unit shutdown should a system unbalance or upset occur. Analarm circuit is energized under these circumstances.

Stand-alone Unit ControlsThe MicroTech unit controller is a microprocessor-based direct digital control systemdesigned to provide sophisticated monitoring and control. Designed with the system operatorin mind, the MicroTech controller features an easy to use 12-key keypad and 32-characterdisplay that provides access to temperatures, pressures, set points, operating states,schedules and alarm messages in either English or Metric units. The controller includespassword protection to guard against unauthorized or accidental set point or parameterchanges.

The MicroTech unit controller can be used as a stand-alone controller, or it can be integratedinto a MicroTech network by using the Network Master Panel or the Remote Monitoringand Sequencing Panel. Regardless of whether the controller is stand-alone or included in anetwork, an IBM-compatible computer containing MicroTech Monitor software can beconnected to give the operator full-screen unit monitoring and control capability.

Electronic Expansion ValveThe ALS air-cooled chiller is equipped with the mostadvanced means of refrigerant flow control available.An electronic expansion valve coupled with aMicroTech unit controller and fuzzy control logicprovide excellent operating efficiencies both at full andpart load operation.

Unlike conventional thermal expansion valves whichrequire a large pressure drop across the valve andresult in higher condenser head pressure, the electronicvalve does not need a large pressure drop across it tooperate effectively. During part load operation theelectronic valve allows the system to operate at lowercondensing pressure, minimizes suction line superheat


and provides for a more stable system operation. Unit efficiencies are drastically improved.The electronic expansion valve is an excellent choice of control for the ALS chiller line,providing precise control with a very fast response time.

Optional Remote Monitoring and Sequencing PanelThe MicroTech Remote Monitoring and Sequencing (RMS) panel provides monitoring ofremote chillers via a single twisted pair of wires. The RMS panel allows the user to accessinformation such as unit status, temperatures and pressures, all control set points, alarmconditions, time and date of alarm conditions, as well as the ability to clear alarms remotely.The RMS panel is equipped with a keypad/display that is identical to the chiller controller'skeypad/display. With a special keystroke combination, the RMS keypad/display can beinterfaced with any chiller controller. It then operates identically to the chiller-mountedkeypad/display. Thus the operator has full access to all networked chillers from a singleremote location. Panel-mounted LEDs clearly indicate with which controller the RMS Panelkeypad/display is currently interfaced.

Any chiller alarm or loss of communication alarm that occurs will be indicated by a panel-mounted alarm LED. An alarm will also cause the panel-mounted annunciator to sound.The volume can be adjusted with a small potentiometer. Any alarm in the network can becleared at the RMS panel keypad.

Optional Personal Computer MonitoringA personal computer equipped with MicroTech Monitor software can be used to provide ahigh-level interface with the MicroTech controller. It can be connected to the controllereither directly or remotely via phone lines with an optional modem. If the controller is part ofa MicroTech network personal computer monitoring can be done via networkcommunications.

Optional Network Master PanelThe MicroTech Network Master Panel (NMP) allows multiple screw chiller controllers to beincorporated into a building-wide network with other MicroTech unit and auxiliarycontrollers. In conjunction with a personal computer, it provides the building operator withthe capability to perform advanced equipment control and monitoring from a central orremote location.

Optional Open ProtocolOpen Protocol is a commitment from McQuay International to provide a cost effectivemeans to building automation through a strategic and joint effort with major temperaturecontrol companies. Open Protocol provides an interface between one or multiple MicroTechcontrollers and the building automation system. The result is reduced installation costs,greater reliability and a seamless operator interface with all equipment in the building.

The MicroTech Open Protocol Master (OPM) panel is usually required to provide thetemperature control company a single-point connection when two or more MicroTechcontrollers are being networked with the temperature control company's system.


Selection Procedures

60 Hz - I-P UnitsThe Performance Data on the following pages are based on a 10 degree F (5.5 degree C)delta-T through the evaporator (2.4 gpm/ton). Adjustment factors for other delta-Ts can befound in Table 2. The minimum leaving chilled water temperature without glycol is 40.0°F(4.4°C). For brine selections refer to Table 1 for ethylene or propylene glycol adjustmentfactors. Ratings are based on a 0.0001 (0.0176) fouling factor in the evaporator and sealevel operation. For other fouling factors or elevations refer to Table 2.

For applications falling outside the catalog ratings contact your local McQuay salesrepresentative.

Selection Example

Given: 120 tons

95°F ambient air temperature, 2,000 foot elevation

288 gpm, 54°F to 44°F, 0.0001 evaporator fouling factor

1. Use the following formula to calculate any missing elements:

(gpm x delta-T) /24 = tons

2. From Performance Table 4, an ALS 125B at the given conditions will produce 123.0 tonswith a compressor kW input of 142.9 and a unit EER of 9.3. Correct for elevation fromTable 2:

Capacity: 123.0 tons x 0.986 = 121.3 tons

Power: 142.9 kW x 1.009 = 144.2 kW

EER = Output / Input = 9.3 x 0.986 / 1.009 = 9.1

3. Determine the evaporator pressure drop. Using Figure 3, enter at 288 gpm and follow upto the ALS 125B line intersect. Read horizontally to obtain an evaporator pressure dropof 17 ft.


Selection example utilizing ethylene glycol

Given:

145 tons,

54°F to 44°F chilled fluid temperature

0.0001 evaporator fouling factor.

Protect against freezing to 0°F

1. From Table 1 select an ethylene glycol concentration of 40% to protect against freezingat 0°F.

2. Adjustment factors at 40% glycol:

Capacity = 0.961,

Power = 0.976,

Flow = 1.121,

Pressure Drop = 1.263.

3. Divide the required capacity by the capacity adjustment factor to obtain necessaryadjusted capacity from the tables.

145 tons / 0.961 = 150.9 tons

4. Select an ALS 155B with a capacity of 154.0 tons and correct with 40% ethylene glycolfactors.

Correct capacity: 0.961 x 154.0 tons = 148.0 tons.

Correct compressor power: 0.976 x 177.8 kW = 173.5 kW

5. Correct chilled fluid flow:

Fluid flow (water) at 145 tons

gpm (water) = (tons x 24) / delta-T

gpm = (145 tons x 24) / 10 degrees = 348 gpm

Fluid flow (40% EG solution):

348 gpm(water) x 1.121 flow correction factor = 390 gpm(ethylene glycol)

6. Determine the evaporator pressure drop. Using Figure 3, enter at 348 gpm(water) andfollow to the ALS 125 line intersect. Read horizontally to obtain an evaporator pressuredrop of 16.8 ft.

7. Correct the pressure drop for 40% EG solution:

16.8 ft x 1.263 pressure drop correction factor = 21.2 ft for ethylene glycol.


Application Adjustment Factors

Ethylene and Propylene Glycol FactorsALS chiller units are designed to operate with a leaving chilled fluid temperatures of 21.0°Fto 50.0°F (-6.1°C to 10.0°C). Leaving chilled fluid temperatures below 40°F (4.4°C) resultin evaporating temperatures at or below the freezing point of water and a glycol solution isrequired. The use of glycol will reduce the performance of the unit depending on itsconcentration. This should be taken into consideration during initial system design. Onglycol applications the supplier normally recommends that a minimum of 25% solution byweight be used for protection against corrosion.

Altitude Correction FactorsPerformance tables are based on sea level altitude. At other than sea level the performanceof the unit will be decreased due to the lower air density. For performance at elevationsother than sea level refer to Table 2.

Evaporator Temperature Drop FactorsPerformance tables are based on a 10 degree F (5.6 degree C) temperature drop through theevaporator. Other delta-Ts will require adjustment factors found in Table 2. Temperaturedrops outside a 6 to 16 degree F (3.3 to 8.9 degree C) range may adversely affect thecontrol system's capability to maintain acceptable control and are not recommended.

The maximum water temperature that can be circulated through the evaporator in a non-operating mode is 100°F (37.8°C).

Fouling FactorPerformance tables are based on water with a fouling factor of 0.0001 (0.0176) per ARI550/590-98. As fouling is increased, performance decreases. For performance at otherfouling factors refer to Table 2.

Foreign matter in the chilled water system will adversely affect the heat transfer capabilityof the evaporator, and could increase the pressure drop and reduce the water flow. Toinsure optimum unit operation, proper water treatment and filtration must be maintained.

Table 1, Freeze ProtectionPercent Volume Glycol Concentration Required

Temperature For Freeze Protection For Burst Protection°F (°C) Ethylene Glycol Propylene Glycol Ethylene Glycol Propylene Glycol20 (6.7) 16 18 11 12

10 (-12.2) 25 29 17 200 (-17.8) 33 36 22 24

-10 (-23.3) 39 42 26 28-20 (-28.9) 44 46 30 30-30 (-34.4) 48 50 30 33-40 (-40.0) 52 54 30 35-50 (-45.6) 56 57 30 35-60 (-51.1) 60 60 30 35

Units operating with glycol are not included in the ARI Certification Program


Table 2, Correction FactorsChilledWater

Fouling Factor

Delta-T 0.0001 (0.0176) 0.00025 (0.044) 0.00075 (0.132) 0.00175 (0.308)ALTITUDE

°F °C Cap. Power Cap. Power Cap. Power Cap. Power

6 3.3 0.992 0.995 0.985 0.993 0.962 0.986 0.919 0.9728 4.4 0.995 0.997 0.988 0.995 0.965 0.988 0.922 0.974

SEA 10 5.6 1.000 1.000 0.993 0.998 0.970 0.991 0.927 0.977LEVEL 12 6.7 1.005 1.002 0.998 1.000 0.975 0.993 0.932 0.979

14 6.8 1.010 1.005 1.003 1.003 0.980 0.996 0.936 0.98216 8.9 1.014 1.007 1.007 1.005 0.984 0.998 0.940 0.984

6 3.3 0.978 1.005 0.971 1.003 0.949 0.996 0.906 0.9828 4.4 0.982 1.007 0.975 1.005 0.953 0.998 0.910 0.984

2000 feet 10 5.6 0.986 1.009 0.979 1.007 0.956 1.000 0.914 0.986(610 m) 12 6.7 0.992 1.011 0.985 1.009 0.962 1.002 0.919 0.988

14 6.8 0.997 1.014 0.990 1.012 0.967 1.005 0.924 0.99116 8.9 1.000 1.016 0.993 1.014 0.970 1.007 0.927 0.993

6 3.3 0.966 1.016 0.959 1.014 0.937 1.007 0.895 0.9938 4.4 0.969 1.018 0.962 1.016 0.940 1.009 0.898 0.995

4000 feet 10 5.6 0.973 1.021 0.966 1.019 0.944 1.012 0.902 0.998(1220 m) 12 6.7 0.978 1.025 0.971 1.023 0.949 1.016 0.906 1.002

14 6.8 0.982 1.027 0.975 1.025 0.953 1.018 0.910 1.00416 8.9 0.986 1.028 0.979 1.026 0.956 1.019 0.914 1.005

6 3.3 0.953 1.025 0.946 1.023 0.924 1.016 0.883 1.0028 4.4 0.955 1.028 0.948 1.026 0.926 1.019 0.885 1.005

6000 feet 10 5.6 0.959 1.031 0.952 1.029 0.930 1.022 0.889 1.008(1830 m) 12 6.7 0.963 1.034 0.956 1.032 0.934 1.024 0.893 1.011

14 6.8 0.968 1.036 0.961 1.034 0.939 1.026 0.897 1.01316 8.9 0.972 1.037 0.965 1.035 0.943 1.027 0.901 1.014

Table 3a, Ethylene Glycol Adjustment Table 3b, Propylene Glycol AdjustmentFreezePoint%

E.G. °F (°C)Cap. Power Flow PD

10 26 (-3) 0.991 0.996 1.013 1.07020 18 (-8) 0.982 0.992 1.040 1.12930 7 (-14) 0.972 0.986 1.074 1.18140 -8 (-22) 0.961 0.976 1.121 1.26350 -29 (-34) 0.946 0.966 1.178 1.308

Units operating with glycol are not included in the ARI Certification Program

FreezePoint%

P.G. °F (°C)Cap. Power Flow PD

10 26 (-3) 0.987 0.992 1.010 1.06820 19 (-7) 0.975 0.985 1.028 1.14730 9 (-13) 0.962 0.978 1.050 1.24840 -6 (-21) 0.946 0.971 1.078 1.36650 -28 (-33) 0.929 0.965 1.116 1.481


Performance Data

Table 4, ALS 125B – ALS 204B, I-P UnitsAMBIENT AIR TEMPERATURE

ALS LWT 75°F 85°F 95°F 105°F 115°FSIZE (°F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

Tons kWiEER

Tons kWiEER

Tons kWiEER

Tons kWiEER

Tons kWiEER

40.0 126.8 113.0 11.8 121.5 126.8 10.1 116.3 140.7 8.9 110.9 159.3 7.6 104.2 179.9 6.342.0 130.1 113.8 12.0 124.8 127.7 10.5 119.5 141.7 9.1 114.1 160.4 7.7 107.1 180.9 6.5

125B 44.0 133.4 114.3 12.4 128.2 128.7 10.6 123.0 142.9 9.3 117.7 161.6 7.9 110.3 181.4 6.746.0 136.8 115.2 12.6 131.6 129.5 10.9 126.5 143.9 9.5 120.9 163.0 8.1 113.3 182.7 6.948.0 140.1 115.9 12.8 135.1 130.5 11.1 130.0 145.1 9.7 124.4 164.5 8.2 116.6 183.9 7.050.0 143.0 116.8 12.9 138.3 131.8 11.3 133.6 146.8 9.9 127.9 166.1 8.4 120.2 185.1 7.240.0 142.2 128.0 11.8 136.3 143.6 10.2 130.5 159.3 8.9 124.5 180.5 7.6 117.0 203.8 6.342.0 145.9 128.8 12.0 140.1 144.6 10.5 134.1 160.5 9.1 128.0 181.7 7.7 120.2 204.8 6.5

140B 44.0 149.7 129.5 12.4 143.8 145.7 10.7 138.0 161.8 9.3 132.1 183.0 7.9 123.8 205.5 6.746.0 153.5 130.4 12.6 147.7 146.7 10.9 142.0 163.0 9.5 135.7 184.6 8.1 127.2 206.9 6.948.0 157.2 131.3 12.9 151.5 147.8 11.1 145.8 164.4 9.7 139.6 186.3 8.2 130.8 208.2 7.050.0 160.5 132.2 13.0 155.2 149.2 11.3 149.9 166.2 9.9 143.5 188.1 8.4 134.8 209.6 7.240.0 158.7 140.6 11.9 152.2 157.8 10.2 145.6 175.0 9.0 138.9 198.2 7.7 130.5 223.8 6.442.0 162.9 141.5 12.1 156.3 158.9 10.6 149.6 176.3 9.2 142.8 199.6 7.8 134.1 225.0 6.6

155B 44.0 167.0 142.2 12.5 160.5 160.1 10.8 154.0 177.8 9.4 147.4 201.1 8.0 138.1 225.7 6.846.0 171.2 143.3 12.7 164.8 161.2 11.0 158.4 179.0 9.6 151.4 202.8 8.2 141.9 227.3 7.048.0 175.4 144.2 13.0 169.1 162.4 11.2 162.7 180.6 9.8 155.8 204.6 8.3 146.0 228.7 7.150.0 179.1 145.3 13.1 173.2 163.9 11.4 167.2 182.6 10.0 160.2 206.6 8.5 150.5 230.2 7.240.0 173.1 156.6 11.8 166.0 175.7 10.1 158.8 194.8 8.9 151.5 220.7 7.6 142.4 249.2 6.342.0 177.7 157.6 12.0 170.5 176.9 10.5 163.2 196.3 9.1 155.8 222.2 7.7 146.3 250.5 6.5

170B 44.0 182.2 158.4 12.4 175.1 178.3 10.6 168.0 198.0 9.3 160.8 223.9 7.9 150.7 251.3 6.746.0 186.8 159.6 12.6 179.8 179.5 10.9 172.8 199.4 9.5 165.1 225.8 8.1 154.8 253.1 6.948.0 191.4 160.6 12.8 184.5 180.8 11.1 177.5 201.0 9.7 169.9 227.9 8.2 159.3 254.7 7.050.0 195.4 161.7 12.9 188.9 182.5 11.3 182.4 203.3 9.9 174.7 230.0 8.4 164.1 256.4 7.240.0 176.2 151.8 12.2 168.9 170.4 10.5 161.7 188.9 9.2 154.2 214.0 7.9 144.9 241.7 6.542.0 180.8 152.8 12.4 173.6 171.5 10.8 166.1 190.3 9.4 158.6 215.5 8.0 148.9 242.9 6.7

175B 44.0 185.4 153.6 12.8 178.2 172.9 11.0 171.0 192.0 9.6 163.6 217.1 8.2 153.4 243.7 6.946.0 190.2 154.7 13.0 183.0 174.0 11.2 175.9 193.3 9.8 168.1 219.0 8.4 157.6 245.4 7.148.0 194.8 155.7 13.2 187.8 175.3 11.4 180.7 194.9 10.0 173.0 220.9 8.4 162.1 246.9 7.250.0 198.9 156.8 13.3 192.3 177.0 11.6 185.7 197.1 10.2 177.8 223.0 8.6 167.1 248.6 7.440.0 187.6 164.6 12.1 179.8 184.7 10.4 172.1 204.8 9.1 164.2 232.0 7.8 154.2 262.0 6.542.0 192.5 165.6 12.3 184.7 185.9 10.7 176.8 206.3 9.3 168.8 233.6 7.9 158.5 263.3 6.7

185B 44.0 197.4 166.5 12.6 189.6 187.4 10.9 182.0 208.1 9.5 174.2 235.4 8.1 163.3 264.2 6.846.0 202.4 167.7 12.8 194.7 188.6 11.1 187.2 209.6 9.7 178.9 237.4 8.3 167.7 266.0 7.048.0 207.3 168.8 13.1 199.8 190.1 11.3 192.3 211.3 9.9 184.1 239.5 8.4 172.5 267.7 7.150.0 211.7 170.0 13.2 204.7 191.9 11.5 197.7 213.7 10.1 189.3 241.8 8.6 177.8 269.5 7.340.0 193.7 170.6 12.1 185.7 191.4 10.4 177.8 212.3 9.1 169.6 240.5 7.8 159.3 271.5 6.542.0 198.8 171.7 12.3 190.8 192.7 10.7 182.6 213.8 9.3 174.4 242.1 7.9 163.7 272.9 6.7

195B 44.0 203.9 172.5 12.6 195.9 194.2 10.9 188.0 215.7 9.5 179.9 243.9 8.1 168.6 273.8 6.846.0 209.1 173.8 12.8 201.2 195.5 11.1 193.4 217.2 9.7 184.8 246.0 8.3 173.2 275.7 7.048.0 214.1 175.0 13.1 206.4 197.0 11.3 198.7 219.0 9.9 190.2 248.2 8.4 178.2 277.5 7.150.0 218.6 176.2 13.2 211.4 198.9 11.5 204.2 221.5 10.1 195.5 250.6 8.6 183.7 279.3 7.340.0 208.2 176.9 12.2 199.6 198.5 10.5 191.0 220.2 9.2 182.2 249.4 7.9 171.2 281.6 6.542.0 213.6 178.1 12.4 205.0 199.9 10.8 196.2 221.8 9.4 187.4 251.1 8.0 175.9 283.1 6.7

204B 44.0 219.1 179.0 12.8 210.5 201.4 11.0 202.0 223.7 9.6 193.3 253.0 8.2 181.2 284.0 6.946.0 224.6 180.3 13.0 216.1 202.8 11.2 207.8 225.3 9.8 198.6 255.2 8.4 186.1 286.0 7.148.0 230.1 181.5 13.2 221.8 204.3 11.4 213.5 227.2 10.0 204.3 257.5 8.4 191.5 287.8 7.250.0 234.9 182.8 13.3 227.1 206.3 11.6 219.4 229.7 10.2 210.1 259.9 8.6 197.4 289.7 7.4

NOTES:1. Rated in accordance with ARI Standard 550/590. Shaded and bold ratings are certified in accordance with the ARI Water-Chilling Packages Using the

Vapor Compression Cycle Certification Program, which is based on ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Ratings based on HCFC-22, evaporator fouling factor of 0.0001, 10 degree delta-T, evaporator flow of 2.4 gpm/ton and sea level altitude.4. For units with SpeedTrol option multiply capacity and COP by 0.99.5. For units operating at 208 volt, multiply capacity by 0.98.6. Interpolation is allowed, extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.7. KW input is for compressors only. EER is for the entire unit, including compressors, fan motors and control power. Total power to the unit can be

calculated by: kW = tons x 12 / EER8. Ratings are valid for operation on 3 phase, 60 Hz, and 208//230/380/460/575 volts.


9. Compressor loading and unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech controlalgorithms.


ALS LWT 75°F 85°F 95°F 105°F 115°FSIZE (°F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

Tons kWiEER

Tons kWiEER

Tons kWiEER

Tons kWiEER

Tons kWiEER

40.0 234.8 190.1 13.2 225.2 213.8 11.4 215.6 237.4 9.9 203.5 270.1 8.3 191.4 302.7 7.042.0 238.3 191.2 13.3 228.8 214.9 11.5 219.3 238.7 10.0 207.1 271.7 8.4 194.7 304.8 7.1

220B 44.0 241.6 192.0 13.4 232.4 216.1 11.6 223.0 240.2 10.1 210.5 273.4 8.5 198.0 306.6 7.246.0 248.0 193.4 13.7 238.6 218.1 11.8 229.3 242.7 10.3 216.6 276.7 8.6 204.0 310.8 7.348.0 254.2 194.8 13.9 244.9 220.1 12.0 235.5 245.2 10.5 222.7 280.1 8.8 210.0 314.8 7.450.0 260.9 196.4 14.2 251.7 222.3 12.3 242.5 248.1 10.7 229.6 283.7 9.0 216.6 319.4 7.640.0 249.6 205.4 13.0 239.4 231.0 11.2 229.2 256.5 9.7 216.3 291.8 8.1 203.5 327.1 6.842.0 253.2 206.5 13.1 243.2 232.2 11.3 233.1 257.9 9.8 220.1 293.6 8.2 206.9 329.3 6.9

235B 44.0 256.8 207.4 13.2 247.0 233.5 11.3 237.0 259.5 9.9 223.7 295.4 8.3 210.4 331.3 7.046.0 263.5 209.0 13.4 253.6 235.6 11.6 243.7 262.2 10.1 230.2 298.9 8.4 216.9 335.8 7.148.0 270.2 210.5 13.7 260.2 237.8 11.8 250.3 264.9 10.3 236.6 302.7 8.6 223.1 340.2 7.250.0 277.3 212.2 14.0 267.5 240.1 12.1 257.7 268.1 10.5 244.0 306.6 8.8 230.2 345.1 7.440.0 257.6 217.9 12.5 247.1 245.6 10.8 236.5 273.3 9.4 222.9 310.7 7.8 209.3 348.3 6.742.0 264.5 219.6 12.8 253.9 247.7 11.1 243.3 275.8 9.6 229.1 313.2 8.0 214.9 350.5 6.8

250B 44.0 271.5 221.3 13.0 260.8 249.8 11.2 250.0 278.3 9.8 235.3 315.5 8.1 220.6 352.7 7.046.0 278.3 223.1 13.3 267.8 252.2 11.5 257.2 281.3 10.0 242.0 318.2 8.3 227.0 355.1 7.148.0 285.0 224.9 13.5 274.6 254.5 11.7 264.3 284.2 10.1 248.9 317.6 8.5 233.3 357.5 7.350.0 292.0 226.7 13.8 281.8 256.9 11.9 271.3 287.1 10.3 258.6 320.9 8.7 240.1 361.1 7.440.0 267.9 235.4 12.2 257.0 265.3 10.5 246.0 295.2 9.1 231.8 335.6 7.6 217.6 376.2 6.542.0 275.1 237.2 12.4 264.1 267.6 10.7 253.0 297.9 9.3 238.3 338.3 7.8 223.5 378.6 6.6

265B 44.0 282.3 239.0 12.6 271.2 269.8 10.9 260.0 300.6 9.5 244.7 340.8 7.9 229.5 381.0 6.746.0 289.4 240.9 12.9 278.5 272.4 11.1 267.5 303.8 9.7 251.7 343.7 8.1 236.1 383.6 6.848.0 296.4 242.9 13.1 285.6 274.9 11.3 274.8 306.9 9.8 258.8 343.1 8.3 242.6 386.1 7.050.0 303.7 244.8 13.4 293.0 277.5 11.5 282.2 310.1 10.0 269.0 346.6 8.5 249.7 390.0 7.140.0 280.3 253.0 11.9 268.9 285.2 10.2 257.3 317.4 8.9 242.5 360.8 7.4 227.7 404.4 6.342.0 287.8 255.0 12.2 276.3 287.6 10.5 264.7 320.3 9.1 249.3 363.7 7.6 233.8 407.0 6.4

280B 44.0 295.3 256.9 12.4 283.7 290.0 10.6 272.0 323.2 9.3 256.0 366.3 7.7 240.0 409.6 6.646.0 302.7 259.0 12.6 291.3 292.8 10.9 279.8 326.6 9.5 263.3 369.5 7.9 247.0 412.4 6.748.0 310.1 261.1 12.8 298.8 295.5 11.1 287.5 330.0 9.6 270.8 368.8 8.1 253.8 415.1 6.950.0 317.7 263.2 13.1 306.5 298.3 11.3 295.2 333.3 9.8 281.4 372.6 8.3 261.3 419.2 7.040.0 297.9 244.7 12.6 287.7 273.8 11.0 275.4 307.4 9.5 263.1 344.4 8.2 249.9 384.2 7.042.0 307.4 247.4 12.9 296.9 276.9 11.2 284.2 310.9 9.7 271.5 348.2 8.3 257.8 388.6 7.1

300B 44.0 316.9 250.1 13.2 306.1 280.0 11.4 293.0 314.4 9.9 279.8 352.1 8.5 265.9 392.8 7.346.0 327.0 252.7 13.4 315.9 282.8 11.7 302.4 317.5 10.0 288.8 355.6 8.7 274.3 396.9 7.548.0 337.2 254.9 13.8 325.7 285.3 12.0 311.8 320.3 10.4 297.8 358.8 8.9 282.9 400.4 7.750.0 347.7 257.5 14.1 335.8 288.2 12.3 321.4 323.5 10.5 307.0 362.3 9.1 291.7 404.4 7.840.0 310.1 253.1 12.7 299.5 283.2 11.1 286.7 318.0 9.6 273.9 356.3 8.3 260.1 397.5 7.142.0 320.0 255.9 13.0 309.1 286.5 11.4 295.9 321.6 9.8 282.6 360.3 8.4 268.4 402.0 7.2

315B 44.0 329.9 258.8 13.3 318.7 289.7 11.6 305.0 325.2 10.0 291.3 364.2 8.6 276.8 406.4 7.446.0 340.4 261.4 13.6 328.9 292.5 11.9 314.8 328.5 10.2 300.7 367.9 8.8 285.6 410.6 7.648.0 351.0 263.7 13.9 339.0 295.2 12.1 324.5 331.4 10.5 310.0 371.2 9.0 294.5 414.2 7.850.0 361.9 266.3 14.2 349.5 298.1 12.4 334.6 334.6 10.7 319.6 374.8 9.2 303.6 418.3 7.940.0 324.4 269.2 12.6 313.3 301.2 11.0 299.9 338.3 9.5 286.5 378.9 8.2 272.1 422.8 7.042.0 334.7 272.2 12.9 323.3 304.7 11.2 309.4 342.1 9.7 295.6 383.2 8.3 280.7 427.6 7.1

330B 44.0 345.0 275.2 13.2 333.3 308.1 11.4 319.0 345.9 9.9 304.7 387.4 8.5 289.5 432.2 7.346.0 356.1 278.0 13.4 343.9 311.1 11.7 329.2 349.3 10.0 314.5 391.3 8.7 298.7 436.7 7.548.0 367.1 280.4 13.8 354.6 313.9 12.0 339.4 352.4 10.4 324.2 394.7 8.9 308.0 440.5 7.750.0 378.6 283.3 14.1 365.6 317.1 12.3 349.9 355.9 10.5 334.2 398.6 9.1 317.6 444.9 7.8



calculated by: kW = tons x 12 / EER8. Ratings are valid for operation on 3 phase, 60 Hz, and 208//230/380/460/575 volts.9. Compressor loading and unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech control

algorithms.



ALS LWT 75°F 85°F 95°F 105°F 115°FSIZE (°F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR PWR

Tons kWiEER

Tons kWiEER

Tons kWiEER

Tons kWiEER

Cap.Tons kWi

EER

40.0 333.5 284.1 12.3 322.1 317.9 10.8 308.3 356.9 9.3 294.5 399.8 8.1 279.8 446.1 6.942.0 344.2 287.2 12.6 332.4 321.5 11.0 318.2 361.0 9.5 303.9 404.3 8.1 288.6 451.2 7.0

340B 44.0 354.7 290.4 12.9 342.7 325.1 11.2 328.0 365.0 9.7 313.3 408.8 8.3 297.7 456.1 7.246.0 366.1 293.4 13.1 353.6 328.3 11.5 338.5 368.6 9.8 323.3 412.9 8.5 307.1 460.8 7.448.0 377.5 295.9 13.5 364.6 331.3 11.7 349.0 371.9 10.2 333.3 416.5 8.7 316.7 464.9 7.650.0 389.2 298.9 13.8 375.9 334.6 12.0 359.8 375.6 10.3 343.7 420.7 8.9 326.5 469.5 7.740.0 355.9 282.5 13.0 343.7 316.1 11.3 329.0 355.0 9.8 314.3 397.6 8.5 298.5 443.7 7.242.0 367.3 285.7 13.2 354.7 319.8 11.6 339.5 359.0 10.0 324.3 402.1 8.6 308.0 448.7 7.3

360B 44.0 378.5 288.8 13.6 365.7 323.3 11.8 350.0 363.0 10.2 334.3 406.5 8.8 317.6 453.6 7.546.0 390.7 291.8 13.8 377.4 326.5 12.1 361.2 366.6 10.4 345.0 410.6 9.0 327.7 458.2 7.848.0 402.8 294.3 14.2 389.0 329.5 12.3 372.4 369.9 10.7 355.7 414.3 9.2 337.9 462.3 8.050.0 415.3 297.3 14.5 401.1 332.7 12.6 384.0 373.5 10.9 366.7 418.4 9.4 348.4 466.9 8.140.0 366.0 298.2 12.7 353.5 333.8 11.1 338.4 374.8 9.6 323.3 419.8 8.3 307.0 468.4 7.142.0 377.7 301.6 13.0 364.8 337.6 11.4 349.2 379.0 9.8 333.5 424.5 8.4 316.8 473.8 7.2

370B 44.0 389.3 304.9 13.3 376.1 341.4 11.6 360.0 383.2 10.0 343.8 429.2 8.6 326.7 478.9 7.446.0 401.8 308.0 13.6 388.2 344.7 11.9 371.5 387.0 10.2 354.9 433.5 8.8 337.1 483.8 7.648.0 414.3 310.7 13.9 400.1 347.8 12.1 383.0 390.5 10.5 365.9 437.3 9.0 347.6 488.1 7.850.0 427.2 313.8 14.2 412.6 351.3 12.4 394.9 394.3 10.7 377.2 441.7 9.2 358.4 492.9 7.940.0 378.2 313.0 12.6 365.3 350.2 11.0 349.7 393.3 9.5 334.1 440.5 8.2 317.3 491.5 7.042.0 390.3 316.5 12.9 377.0 354.3 11.2 360.8 397.7 9.7 344.7 445.5 8.3 327.4 497.1 7.1

380B 44.0 402.3 320.0 13.2 388.7 358.2 11.4 372.0 402.1 9.9 355.3 450.4 8.5 337.6 502.5 7.346.0 415.2 323.2 13.4 401.1 361.7 11.7 383.9 406.1 10.0 366.7 454.9 8.7 348.3 507.7 7.548.0 428.1 326.0 13.8 413.5 365.0 12.0 395.8 409.7 10.4 378.1 458.9 8.9 359.2 512.2 7.750.0 441.5 329.3 14.1 426.3 368.6 12.3 408.1 413.8 10.5 389.8 463.5 9.1 370.3 517.2 7.840.0 407.7 319.9 13.0 393.8 358.0 11.3 376.9 401.9 9.8 360.1 450.2 8.5 342.0 502.3 7.242.0 420.8 323.4 13.2 406.4 362.1 11.6 389.0 406.4 10.0 371.5 455.3 8.6 352.9 508.1 7.3

425B 44.0 433.7 327.0 13.6 419.0 366.1 11.8 401.0 411.0 10.2 383.0 460.3 8.8 363.9 513.6 7.546.0 447.6 330.3 13.8 432.4 369.7 12.1 413.8 415.1 10.4 395.3 464.9 9.0 375.5 518.8 7.848.0 461.5 333.2 14.2 445.7 373.0 12.3 426.7 418.8 10.7 407.5 469.0 9.2 387.2 523.4 8.050.0 475.9 336.6 14.5 459.5 376.7 12.6 439.9 422.9 10.9 420.2 473.7 9.4 399.2 528.6 8.1



calculated by: kW = tons x 12 / EER8. Ratings are valid for operation on 3 phase, 60 Hz, and 208//230/380/460/575 volts.9. Compressor loading and unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech control

algorithms.

annmariej

annmariej


Table 7, ALS 125B - ALS 204B, SI UnitsAMBIENT AIR TEMPERATURE

ALS LWT 30°° C (86 °° F) 35°° C (95 °° F) 40°° C (104 °° F) 45°° C (113 °° F) 50°° C (122 °° F)

SIZE °° C ( °° F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

kW kWiCOP

kW kWiCOP

kW kWiCOP

kW kWiCOP

kW kWiCOP

5.0 (41.0°F) 434.6 126.9 3.0 416.9 140.8 2.7 399.2 154.8 2.3 381.6 168.8 2.1 363.9 183.0 1.8

6.0 (42.8°F) 445.5 127.9 3.1 427.5 142.0 2.7 409.6 156.2 2.4 391.6 170.4 2.1 373.6 184.5 1.9125B 7.0 (44.6°F) 456.2 128.9 3.2 438.1 143.3 2.8 419.9 157.6 2.4 401.7 171.9 2.1 383.4 186.0 1.9

8.0 (46.4°F) 467.0 129.8 3.2 448.6 144.4 2.8 430.3 159.0 2.5 411.8 173.6 2.2 393.1 187.5 1.9

9.0 (48.2°F) 477.7 130.8 3.3 459.1 145.5 2.8 440.5 160.4 2.5 421.9 175.2 2.2 402.8 190.0 2.0

10.0 (50.0°F) 488.5 131.7 3.3 469.7 146.8 2.9 450.9 161.8 2.5 432.0 176.9 2.2 412.5 192.3 2.0

5.0 (41.0°F) 487.6 143.7 3.1 467.8 159.5 2.7 447.9 175.4 2.3 428.1 191.1 2.1 408.3 207.3 1.8

6.0 (42.8°F) 499.8 144.8 3.1 479.6 160.9 2.7 459.5 176.9 2.4 439.4 193.0 2.1 419.2 208.9 1.9140B 7.0 (44.6°F) 511.8 145.9 3.2 491.5 162.2 2.8 471.1 178.5 2.4 450.7 194.7 2.1 430.2 210.7 1.9

8.0 (46.4°F) 523.9 146.9 3.2 503.3 163.6 2.8 482.7 180.0 2.5 462.1 196.5 2.2 441.0 212.3 1.9

9.0 (48.2°F) 536.0 148.1 3.3 515.1 164.8 2.9 494.3 181.6 2.5 473.4 198.5 2.2 451.9 215.2 2.0

10.0 (50.0°F) 548.1 149.2 3.3 526.9 166.2 2.9 505.9 183.3 2.5 484.7 200.3 2.2 462.8 217.7 2.0

5.0 (41.0°F) 544.2 157.9 3.1 522.0 175.2 2.7 499.8 192.6 2.4 477.7 210.0 2.1 455.7 227.7 1.8

6.0 (42.8°F) 557.7 159.1 3.1 535.2 176.7 2.7 512.8 194.3 2.4 490.4 212.0 2.1 467.8 229.5 1.9155B 7.0 (44.6°F) 571.2 160.3 3.2 548.5 178.2 2.8 525.7 196.1 2.4 503.0 213.9 2.2 480.1 231.4 1.9

8.0 (46.4°F) 584.7 161.4 3.2 561.6 179.7 2.8 538.7 197.8 2.5 515.6 215.9 2.2 492.2 233.3 2.0

9.0 (48.2°F) 598.1 162.7 3.3 574.8 181.0 2.9 551.6 199.5 2.5 528.3 218.0 2.2 504.3 236.4 2.0

10.0 (50.0°F) 611.6 163.9 3.3 588.0 182.6 2.9 564.5 201.3 2.6 540.9 220.0 2.3 516.4 239.2 2.0

5.0 (41.0°F) 593.6 175.8 3.1 569.4 195.1 2.7 545.3 214.5 2.3 521.1 233.8 2.1 497.1 253.5 1.8

6.0 (42.8°F) 608.5 177.1 3.1 583.9 196.8 2.7 559.4 216.4 2.4 534.9 236.1 2.1 510.3 255.6 1.9170B 7.0 (44.6°F) 623.1 178.5 3.2 598.3 198.5 2.8 573.5 218.4 2.4 548.7 238.2 2.1 523.7 257.7 1.9

8.0 (46.4°F) 637.8 179.8 3.2 612.7 200.1 2.8 587.7 220.2 2.5 562.5 240.4 2.2 536.9 259.7 1.9

9.0 (48.2°F) 652.5 181.2 3.3 627.1 201.6 2.8 601.7 222.2 2.5 576.3 242.8 2.2 550.1 263.2 2.0

10.0 (50.0°F) 667.2 182.5 3.3 641.5 203.3 2.9 615.8 224.2 2.5 590.1 245.0 2.2 563.4 266.3 2.0

5.0 (41.0°F) 604.2 170.4 3.1 579.6 189.2 2.7 555.0 208.0 2.4 530.5 226.7 2.1 506.0 245.8 1.9

6.0 (42.8°F) 619.3 171.7 3.2 594.3 190.8 2.8 569.4 209.8 2.5 544.5 228.9 2.2 519.4 247.8 1.9175B 7.0 (44.6°F) 634.2 173.1 3.3 609.0 192.4 2.8 583.7 211.7 2.5 558.5 230.9 2.2 533.1 249.9 2.0

8.0 (46.4°F) 649.2 174.3 3.3 623.6 194.0 2.9 598.2 213.5 2.5 572.6 233.1 2.2 546.5 251.8 2.0

9.0 (48.2°F) 664.2 175.6 3.4 638.3 195.4 2.9 612.5 215.4 2.6 586.6 235.4 2.3 559.9 255.2 2.0

10.0 (50.0°F) 679.1 176.9 3.4 652.9 197.1 3.0 626.8 217.3 2.6 600.6 237.5 2.3 573.4 258.2 2.0

5.0 (41.0°F) 643.1 184.8 3.1 616.9 205.1 2.7 590.7 225.5 2.4 564.6 245.8 2.1 538.5 266.5 1.9

6.0 (42.8°F) 659.2 186.2 3.2 632.5 206.8 2.8 606.1 227.5 2.4 579.5 248.1 2.1 552.8 268.6 1.9185B 7.0 (44.6°F) 675.0 187.6 3.2 648.2 208.6 2.8 621.3 229.5 2.5 594.5 250.4 2.2 567.4 270.9 1.9

8.0 (46.4°F) 691.0 188.9 3.3 663.7 210.3 2.9 636.6 231.5 2.5 609.4 252.7 2.2 581.7 273.0 2.0

9.0 (48.2°F) 706.9 190.4 3.3 679.3 211.9 2.9 651.9 233.5 2.6 624.3 255.2 2.3 595.9 276.7 2.0

10.0 (50.0°F) 722.8 191.8 3.4 694.9 213.7 3.0 667.1 235.6 2.6 639.3 257.5 2.3 610.3 280.0 2.0

5.0 (41.0°F) 664.3 191.5 3.1 637.2 212.5 2.7 610.2 233.7 2.4 583.2 254.7 2.1 556.3 276.2 1.9

6.0 (42.8°F) 680.9 193.0 3.2 653.4 214.4 2.8 626.0 235.7 2.4 598.6 257.2 2.1 571.1 278.4 1.9195B 7.0 (44.6°F) 697.3 194.5 3.2 669.5 216.2 2.8 641.8 237.9 2.5 614.1 259.5 2.2 586.1 280.7 1.9

8.0 (46.4°F) 713.8 195.8 3.3 685.6 218.0 2.9 657.6 239.9 2.5 629.5 261.9 2.2 600.8 283.0 2.0

9.0 (48.2°F) 730.2 197.4 3.3 701.7 219.6 2.9 673.3 242.1 2.6 644.9 264.5 2.3 615.6 286.7 2.0

10.0 (50.0°F) 746.6 198.8 3.4 717.9 221.5 3.0 689.1 244.2 2.6 660.4 266.9 2.3 630.4 290.2 2.0

5.0 (41.0°F) 713.8 198.6 3.1 684.7 220.5 2.7 655.6 242.4 2.4 626.6 264.2 2.1 597.7 286.5 1.9

6.0 (42.8°F) 731.6 200.1 3.2 702.0 222.3 2.8 672.7 244.5 2.5 643.2 266.7 2.2 613.6 288.8 1.9204B 7.0 (44.6°F) 749.2 201.7 3.3 719.4 224.2 2.8 689.6 246.7 2.5 659.8 269.1 2.2 629.7 291.2 2.0

8.0 (46.4°F) 766.9 203.1 3.3 736.7 226.1 2.9 706.6 248.8 2.5 676.4 271.7 2.3 645.6 293.5 2.0

9.0 (48.2°F) 784.6 204.7 3.4 754.0 227.7 2.9 723.5 251.1 2.6 692.9 274.3 2.3 661.4 297.4 2.0

10.0 (50.0°F) 802.2 206.2 3.4 771.3 229.7 3.0 740.5 253.3 2.6 709.5 276.8 2.3 677.4 301.0 2.1NOTES1. Rated in accordance with ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Ratings based on HCFC-22, evaporator fouling factor of 0.0001, 10 degree delta-T, evaporator flow of 2.4 gpm/ton and sea level altitude.4. For units with SpeedTrol option multiply capacity and COP by 0.99.5. For units operating at 208 volt, multiply capacity by 0.98.6. Interpolation is allowed, extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.7. KW input is for compressors only. COP is for the entire unit, including compressors, fan motors and control power. Total power to the unit can be

calculated by: kW = kW(output) / COP.8. Ratings are valid for operation on 3 phase, 60 Hz, and 208//230/380/460/575 volts.9. Compressor loading and unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech control

algorithms.




SIZE °° C °° F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

kW kWiCOP

kW kWiCOP

kW kWiCOP

kW kWiCOP

kW kWiCOP

5.0 (41.0°F) 802.7 213.3 3.4 767.9 238.1 2.9 733.0 263.0 2.5 698.1 287.9 2.2 663.3 312.7 2.0

6.0 (42.8°F) 819.8 214.9 3.4 784.8 240.2 3.0 749.8 265.5 2.6 714.8 290.7 2.3 679.8 315.9 2.0220B 7.0 (44.6°F) 836.9 216.4 3.5 801.7 242.2 3.0 766.5 267.9 2.6 731.4 293.5 2.3 696.3 319.2 2.0

8.0 (46.4°F) 854.1 218.0 3.5 818.7 244.2 3.0 783.3 270.2 2.7 748.0 296.3 2.3 712.7 322.5 2.1

9.0 (48.2°F) 871.1 219.6 3.6 835.6 246.2 3.1 800.1 272.6 2.7 764.5 299.1 2.4 729.1 325.4 2.1

10.0 (50.0°F) 888.2 221.2 3.6 852.5 248.1 3.1 816.8 275.0 2.7 781.2 301.9 2.4 745.4 329.0 2.1

5.0 (41.0°F) 853.1 230.4 3.3 816.1 257.3 2.9 779.0 284.2 2.5 742.0 311.0 2.2 704.9 337.8 1.9

6.0 (42.8°F) 871.2 232.2 3.4 834.1 259.5 2.9 796.9 286.8 2.5 759.6 314.0 2.2 722.5 341.3 2.0235B 7.0 (44.6°F) 889.5 233.8 3.4 852.0 261.7 2.9 814.6 289.4 2.6 777.3 317.1 2.3 740.0 344.8 2.0

8.0 (46.4°F) 907.7 235.5 3.4 870.1 263.8 3.0 832.5 291.9 2.6 795.0 320.1 2.3 757.4 348.4 2.0

9.0 (48.2°F) 925.8 237.3 3.5 888.0 266.0 3.0 850.3 294.5 2.6 812.5 323.1 2.3 774.8 351.6 2.0

10.0 (50.0°F) 944.0 239.0 3.5 906.0 268.1 3.1 868.1 297.1 2.7 830.2 326.2 2.3 792.2 355.4 2.1

5.0 (41.0°F) 886.1 247.5 3.2 846.7 276.5 2.8 807.2 305.4 2.4 767.7 334.5 2.1 728.2 363.6 1.9

6.0 (42.8°F) 908.1 249.5 3.3 868.1 278.6 2.8 828.1 307.7 2.5 788.3 336.8 2.2 748.5 365.9 1.9250B 7.0 (44.6°F) 930.0 251.3 3.3 889.6 280.7 2.9 849.2 310.0 2.5 808.7 339.3 2.2 768.2 368.6 1.9

8.0 (46.4°F) 952.0 253.4 3.4 911.0 282.8 2.9 870.1 312.3 2.6 829.2 341.6 2.2 788.3 370.9 2.0

9.0 (48.2°F) 973.8 255.3 3.4 932.5 284.9 3.0 891.1 314.5 2.6 849.7 344.0 2.3 808.3 373.5 2.0

10.0 (50.0°F) 995.9 257.4 3.5 954.0 287.1 3.0 912.1 316.8 2.6 870.1 346.5 2.3 828.1 376.2 2.0

5.0 (41.0°F) 921.5 267.3 3.1 880.5 298.6 2.7 839.4 329.9 2.3 798.4 361.3 2.1 757.3 392.7 1.8

6.0 (42.8°F) 944.4 269.4 3.2 902.8 300.9 2.7 861.3 332.4 2.4 819.8 363.7 2.1 778.4 395.2 1.8265B 7.0 (44.6°F) 967.2 271.5 3.2 925.2 303.2 2.8 883.2 334.8 2.4 841.0 366.4 2.1 799.0 398.2 1.9

8.0 (46.4°F) 990.1 273.7 3.3 947.4 305.4 2.8 904.9 337.3 2.5 862.4 369.0 2.2 819.8 400.6 1.9

9.0 (48.2°F) 1012.8 275.8 3.3 969.8 307.8 2.9 926.8 339.7 2.5 883.7 371.6 2.2 840.6 403.4 1.9

10.0 (50.0°F) 1035.7 278.0 3.4 992.1 310.1 2.9 948.6 342.2 2.6 904.9 374.3 2.3 861.2 406.4 2.0

5.0 (41.0°F) 964.0 287.3 3.1 921.2 321.0 2.6 878.2 354.6 2.3 835.2 388.3 2.0 792.3 422.2 1.8

6.0 (42.8°F) 988.0 289.6 3.1 944.5 323.5 2.7 901.0 357.3 2.3 857.6 391.0 2.0 814.4 424.9 1.8280B 7.0 (44.6°F) 1011.9 291.8 3.2 967.9 325.9 2.7 924.0 359.9 2.4 879.9 393.9 2.1 835.8 428.0 1.8

8.0 (46.4°F) 1035.7 294.2 3.2 991.1 328.3 2.8 946.7 362.6 2.4 902.2 396.7 2.1 857.6 430.7 1.9

9.0 (48.2°F) 1059.5 296.4 3.3 1014.6 330.8 2.8 969.5 365.1 2.5 924.5 399.5 2.2 879.4 433.7 1.9

10.0 (50.0°F) 1083.5 298.8 3.3 1037.9 333.3 2.9 992.4 367.8 2.5 946.7 402.4 2.2 900.9 436.9 1.9

5.0 (41.0°F) 1023.4 277.9 3.2 984.6 309.2 2.8 945.6 340.4 2.5 906.7 371.8 2.2 867.8 403.2 2.0

6.0 (42.8°F) 1053.7 280.4 3.3 1013.6 312.0 2.9 973.6 343.7 2.5 933.6 375.2 2.2 893.6 406.7 2.0300B 7.0 (44.6°F) 1083.9 283.0 3.3 1042.8 314.9 2.9 1001.6 346.8 2.6 960.4 378.6 2.3 919.2 410.4 2.0

8.0 (46.4°F) 1114.2 285.6 3.4 1071.9 317.8 3.0 1029.5 349.9 2.6 987.2 382.2 2.3 944.9 414.5 2.1

9.0 (48.2°F) 1144.5 288.2 3.5 1101.0 320.7 3.0 1057.6 353.1 2.7 1014.1 385.6 2.4 970.5 418.1 2.1

10.0 (50.0°F) 1174.8 290.8 3.5 1130.1 323.5 3.1 1085.5 356.3 2.7 1040.8 389.0 2.4 996.1 421.7 2.2

5.0 (41.0°F) 1065.3 287.4 3.2 1024.9 319.9 2.8 984.3 352.2 2.5 943.8 384.7 2.2 903.4 417.1 2.0

6.0 (42.8°F) 1096.9 290.1 3.3 1055.1 322.8 2.9 1013.5 355.5 2.6 971.8 388.2 2.3 930.2 420.7 2.0315B 7.0 (44.6°F) 1128.3 292.8 3.4 1085.5 325.8 3.0 1042.6 358.7 2.6 999.7 391.7 2.3 956.9 424.5 2.1

8.0 (46.4°F) 1159.8 295.5 3.4 1115.8 328.7 3.0 1071.7 362.0 2.7 1027.6 395.4 2.4 983.6 428.8 2.1

9.0 (48.2°F) 1191.3 298.2 3.5 1146.0 331.8 3.1 1100.9 365.2 2.7 1055.6 398.9 2.4 1010.3 432.5 2.1

10.0 (50.0°F) 1222.9 300.8 3.6 1176.4 334.6 3.1 1129.9 368.6 2.8 1083.5 402.4 2.4 1036.9 436.3 2.2

5.0 (41.0°F) 1114.2 305.7 3.2 1071.9 340.2 2.8 1029.5 374.6 2.5 987.1 409.1 2.2 944.8 443.6 2.0

6.0 (42.8°F) 1147.2 308.6 3.3 1103.5 343.3 2.9 1060.0 378.1 2.5 1016.4 412.8 2.2 972.9 447.5 2.0330B 7.0 (44.6°F) 1180.1 311.4 3.4 1135.3 346.5 2.9 1090.5 381.5 2.6 1045.6 416.6 2.3 1000.8 451.5 2.0

8.0 (46.4°F) 1213.1 314.3 3.4 1167.0 349.6 3.0 1120.9 385.0 2.6 1074.8 420.5 2.3 1028.7 456.0 2.1

9.0 (48.2°F) 1246.0 317.1 3.5 1198.7 352.8 3.0 1151.4 388.5 2.7 1104.0 424.2 2.4 1056.7 460.0 2.1

10.0 (50.0°F) 1279.0 319.9 3.5 1230.4 355.9 3.1 1181.8 392.0 2.7 1133.2 428.0 2.4 1084.5 464.0 2.1NOTES1. Rated in accordance with ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Ratings based on HCFC-22, evaporator fouling factor of 0.0001, 10 degree delta-T, evaporator flow of 2.4 gpm/ton and sea level altitude.4. For units with SpeedTrol option multiply capacity and COP by 0.99.5. For units operating at 208 volt, multiply capacity by 0.98.6. Interpolation is allowed, extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.7. KW input is for compressors only. COP is for the entire unit, including compressors, fan motors and control power. Total power to the unit can be


algorithms.




SIZE °° C ( °° F) Cap. PWR Cap. PWR Cap. PWR Cap. PWR Cap. PWR

kW kWiCOP

kW kWiCOP

kW kWiCOP

kW kWiCOP

kW kWiCOP

5.0 (41.0°F) 1145.7 322.6 3.2 1102.2 359.0 2.8 1058.5 395.3 2.4 1015.0 431.7 2.1 971.5 468.1 1.9

6.0 (42.8°F) 1179.6 325.6 3.2 1134.7 362.3 2.8 1089.9 399.0 2.5 1045.1 435.6 2.2 1000.3 472.2 2.0

340B 7.0 (44.6°F) 1213.4 328.6 3.3 1167.3 365.6 2.9 1121.3 402.6 2.5 1075.1 439.6 2.2 1029.0 476.5 2.0

8.0 (46.4°F) 1247.3 331.6 3.3 1200.0 368.9 2.9 1152.5 406.3 2.6 1105.1 443.7 2.3 1057.8 481.2 2.0

9.0 (48.2°F) 1281.2 334.6 3.4 1232.5 372.3 3.0 1183.9 409.9 2.6 1135.2 447.7 2.3 1086.5 485.4 2.1

10.0 (50.0°F) 1315.1 337.6 3.5 1265.1 375.6 3.0 1215.1 413.7 2.7 1165.2 451.6 2.4 1115.1 489.6 2.1

5.0 (41.0°F) 1222.5 320.8 3.3 1176.1 357.1 2.9 1129.5 393.1 2.6 1083.1 429.3 2.3 1036.6 465.6 2.0

6.0 (42.8°F) 1258.7 323.8 3.4 1210.8 360.3 3.0 1163.0 396.8 2.6 1115.2 433.2 2.3 1067.4 469.6 2.1

360B 7.0 (44.6°F) 1294.8 326.8 3.4 1245.6 363.6 3.0 1196.5 400.4 2.7 1147.2 437.2 2.4 1098.1 473.8 2.1

8.0 (46.4°F) 1330.9 329.8 3.5 1280.4 366.9 3.1 1229.8 404.0 2.7 1179.2 441.3 2.4 1128.7 478.6 2.1

9.0 (48.2°F) 1367.1 332.8 3.6 1315.1 370.3 3.1 1263.3 407.7 2.8 1211.3 445.2 2.5 1159.4 482.7 2.2

10.0 (50.0°F) 1403.3 335.7 3.6 1350.0 373.5 3.2 1296.6 411.4 2.8 1243.3 449.1 2.5 1189.9 486.9 2.2

5.0 (41.0°F) 1257.5 338.7 3.2 1209.7 377.0 2.8 1161.8 415.0 2.5 1114.0 453.3 2.2 1066.3 491.5 2.0

6.0 (42.8°F) 1294.7 341.9 3.3 1245.4 380.4 2.9 1196.2 418.9 2.6 1147.1 457.4 2.3 1097.9 495.8 2.0

370B 7.0 (44.6°F) 1331.7 345.0 3.4 1281.2 383.9 3.0 1230.7 422.7 2.6 1180.0 461.5 2.3 1129.4 500.3 2.1

8.0 (46.4°F) 1369.0 348.2 3.4 1317.0 387.4 3.0 1265.0 426.6 2.7 1212.9 465.9 2.4 1161.0 505.2 2.1

9.0 (48.2°F) 1406.2 351.3 3.5 1352.7 390.9 3.1 1299.4 430.4 2.7 1245.9 470.0 2.4 1192.5 509.6 2.1

10.0 (50.0°F) 1443.4 354.4 3.6 1388.5 394.3 3.1 1333.7 434.3 2.8 1278.8 474.2 2.4 1223.9 514.1 2.2

5.0 (41.0°F) 1299.4 355.4 3.2 1250.0 395.6 2.8 1200.5 435.5 2.5 1151.2 475.6 2.2 1101.8 515.8 2.0

6.0 (42.8°F) 1337.8 358.7 3.3 1286.9 399.2 2.9 1236.1 439.6 2.5 1185.3 480.0 2.2 1134.5 520.2 2.0

380B 7.0 (44.6°F) 1376.1 362.0 3.3 1323.9 402.8 2.9 1271.7 443.6 2.6 1219.3 484.3 2.3 1167.1 525.0 2.0

8.0 (46.4°F) 1414.6 365.4 3.4 1360.9 406.5 3.0 1307.1 447.6 2.6 1253.3 488.9 2.3 1199.7 530.2 2.1

9.0 (48.2°F) 1453.0 368.7 3.5 1397.8 410.2 3.0 1342.7 451.6 2.7 1287.5 493.2 2.4 1232.2 534.8 2.1

10.0 (50.0°F) 1491.5 371.9 3.5 1434.8 413.8 3.1 1378.1 455.8 2.7 1321.5 497.6 2.4 1264.7 539.4 2.1

5.0 (41.0°F) 1400.7 363.3 3.3 1347.5 404.3 2.9 1294.1 445.1 2.6 1240.9 486.1 2.3 1187.7 527.1 2.0

6.0 (42.8°F) 1442.1 366.6 3.4 1387.2 408.0 3.0 1332.5 449.3 2.6 1277.7 490.5 2.3 1223.0 531.7 2.1

425B 7.0 (44.6°F) 1483.4 370.0 3.4 1427.1 411.7 3.0 1370.8 453.3 2.7 1314.4 495.0 2.4 1258.1 536.5 2.1

8.0 (46.4°F) 1524.9 373.4 3.5 1467.0 415.4 3.1 1409.0 457.5 2.7 1351.0 499.6 2.4 1293.2 541.8 2.1

9.0 (48.2°F) 1566.3 376.8 3.6 1506.8 419.2 3.1 1447.4 461.6 2.8 1387.8 504.1 2.5 1328.3 546.6 2.2

10.0 (50.0°F) 1607.8 380.1 3.6 1546.7 422.9 3.2 1485.6 465.8 2.8 1424.5 508.5 2.5 1363.2 551.3 2.2

NOTES:1. Rated in accordance with ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Ratings based on HCFC-22, evaporator fouling factor of 0.0001, 10 degree delta-T, evaporator flow of 2.4 gpm/ton and sea level altitude.4. For units with SpeedTrol option multiply capacity and COP by 0.99.5. For units operating at 208 volt, multiply capacity by 0.98.6. Interpolation is allowed, extrapolation is not permitted. Consult McQuay for performance outside the cataloged ratings.7. KW input is for compressors only. COP is for the entire unit, including compressors, fan motors and control power. Total power to the unit can be


algorithms.


Part Load Data

Table 10, ALS 125B – ALS 425BUnit Capacity Power Unit Capacity PowerSize

% LoadTons Unit kW

EER IPLVSize

% LoadTons Unit kW

EER IPLV

100.00 123.0 158.7 9.3 100.00 250.0 306.1 9.875.00 92.3 101.7 10.9 75.00 187.5 197.9 11.450.00 61.5 59.7 12.4 50.00 125.0 116.0 12.9

125B

25.00 30.8 25.9 14.2

11.9 250B

25.00 62.5 51.4 14.6

12.4

100.00 138.0 177.6 9.3 100.00 260.0 328.4 9.575.00 103.5 113.9 10.9 75.00 195.0 212.3 11.050.00 69.0 66.8 12.4 50.00 130.0 124.4 12.5

140B

25.00 34.5 29.0 14.3

12.0 265B

25.00 65.0 55.1 14.2

12.1

100.00 154.0 196.6 9.4 100.00 272.0 351.0 9.375.00 115.5 126.0 11.0 75.00 204.0 226.9 10.850.00 77.0 73.9 12.5 50.00 136.0 132.9 12.3

155B

25.00 38.5 32.1 14.4

12.1 280B

25.00 68.0 58.9 13.9

11.8

100.00 168.0 216.8 9.3 100.00 293.0 355.2 9.975.00 126.0 139.0 10.9 75.00 219.8 229.6 11.550.00 84.0 81.5 12.4 50.00 146.5 130.6 13.5

170B

25.00 42.0 35.4 14.2

11.9 300B

25.00 73.3 56.6 15.5

12.8

100.00 171.0 213.8 9.6 100.00 305.0 366.0 10.075.00 128.3 137.0 11.2 75.00 228.8 236.6 11.650.00 85.5 80.4 12.8 50.00 152.5 134.6 13.6

175B

25.00 42.8 34.9 14.7

12.3 315B

25.00 76.3 58.3 15.7

13.0

100.00 182.0 229.9 9.5 100.00 319.0 386.7 9.975.00 136.5 147.4 11.1 75.00 239.3 250.0 11.550.00 91.0 86.4 12.6 50.00 159.5 142.2 13.5

185B

25.00 45.5 37.6 14.5

12.2 330B

25.00 79.8 61.6 15.5

12.8

100.00 188.0 237.5 9.5 100.00 328.0 405.8 9.775.00 141.0 152.2 11.1 75.00 246.0 262.4 11.350.00 94.0 89.3 12.6 50.00 164.0 149.2 13.2

195B

25.00 47.0 38.8 14.5

12.2 340B

25.00 82.0 64.6 15.2

12.6

100.00 202.0 252.5 9.6 100.00 350.0 411.8 10.275.00 151.5 161.9 11.2 75.00 262.5 266.2 11.850.00 101.0 94.9 12.8 50.00 175.0 151.4 13.9

204B

25.00 50.5 41.3 14.7

12.3 360B

25.00 87.5 65.6 16.0

13.2

100.00 223.0 265.0 10.1 100.00 360.0 432.0 10.075.00 167.3 171.3 11.7 75.00 270.0 279.3 11.650.00 111.5 100.4 13.3 50.00 180.0 158.8 13.6

220B

25.00 55.8 44.5 15.0

12.8 370B

25.00 90.0 68.8 15.7

13.0

100.00 237.0 287.3 9.9 100.00 372.0 450.9 9.975.00 177.8 185.7 11.5 75.00 279.0 291.5 11.550.00 118.5 108.8 13.1 50.00 186.0 165.8 13.5

235B

25.00 59.3 48.2 14.8

12.6 380B

25.00 93.0 71.8 15.5

12.8

100.00 401.0 471.8 10.275.00 300.8 305.0 11.850.00 200.5 173.4 13.9

425B

25.00 100.3 75.1 16.0

13.2

NOTES:1. Certified in accordance with the ARI Water-Chilling Packages Using the Vapor Compression Cycle Certification Program, which is based on

ARI Standard 550/590.2. Units with remote evaporators are not included in the ARI Certification Program.3. Compressor unloading is adaptively determined by system load, ambient air temperature, and other inputs to the MicroTech control algorithms.

annmariej


Pressure Drop

Figure 3, ALS 125B - ALS 425B, Evaporator Pressure Drop

ALS Unit

Size

Minimum

Flow gpm

Pressure

Drop ft.

Maximum

Flow gpm

Pressure

Drop ft.

ALS Unit

Size

Minimum

Flow gpm

Pressure

Drop ft.

Maximum

Flow

gpm

Pressure

Drop ft.

125 177 7.0 472 43.2 265 374 3.7 998 33.6

140 199 5.5 530 37.2 280 392 4.1 1044 37.2

155 222 6.8 591 46.1 300 422 3.4 1125 31.0

170 242 8.1 645 54.6 315 439 3.8 1171 33.9

175 246 8.4 657 56.5 330 459 4.2 1225 37.4

185 262 9.4 699 63.8 340 472 4.4 1260 39.8

195 271 6.8 722 45.5 360 504 5.1 1344 46.1

204 291 4.5 776 33.1 370 518 5.5 1382 49.1

220 321 5.3 856 39.2 380 536 5.9 1428 52.8

235 341 6.0 910 44.4 425 577 7.8 1540 67.8

annmariej


250 360 3.4 960 30.8


Sound Data

Sound levels are as important as unit cost and efficiency, and must be addressed before thestart of any project design. Efforts by McQuay design engineers to design chillers that aresensitive to the sound requirements of the market, combined with McQuay’s inherently quietrotary screw compressors, have paid off.

StandardsARI has established standards to provide uniform methods for the determination of the soundlevels of equipment. For large air-cooled chillers it is ARI Standard 370, Sound Ratings ofLarge Outdoor Refrigeration and Air-Conditioning Equipment.

Background InformationSound is a vibration in an elastic medium and is essentially a pressure and particledisplacement phenomena. A vibrating body produces compression waves and as the wavesare emitted from the vibrating body, molecules are ultimately compressed. These values aretransmitted through gas, liquid, solids-anything which is elastic or viscous.

The sound data provided in this section is presented with both sound pressure and soundpower levels. Sound power is the total sound energy radiated by a source per unit of timeintegrated over the surface through which the sound is radiated. Sound power is acalculated quantity and cannot be measured directly like sound pressure. Sound power is notdependent on the surrounding environment or distance from the source.

Sound pressure varies with the distance from the source and is dependent on itssurroundings. For example, a brick wall located 10 feet from a unit will affect the soundpressure measurements differently than a brick wall at 20 feet. Sound pressure is measuredin decibels (dB), which is a dimensionless ratio (on a logarithmic scale) between measuredsound pressure and a reference sound pressure level.

Sound Pressure Levels - Full LoadAll sound pressure tables give the overall "A" weighted sound pressure levels which areconsidered typical of what may be measured in a free field with a hand held sound meter inthe absence of any nearby reflective surfaces. For air-cooled units, the sound pressurelevels are measured at 30 feet (10 meters) from the side of the unit at 100% unit load andARI conditions; 95°F (35°C) ambient air temperature and 54/44°F (12/7°C) chilled watertemperatures.

Sound Power LevelsAcoustical consultants may require sound power octave band data to perform a detailedacoustical analysis. Sound measurements are taken over a prescribed area around the unitand the data is mathematically calculated to give the sound power in dB.

ALS Sound DataSound power and sound pressure data for the ALS units can be found in Table 11 and Table12. More detailed information on sound attenuation, the effect of multiple unit installations,sound reflection from buildings, and other sound related subjects can be found in theMcQuay Application Manual, AM ALSWHS.


Table 11, Sound Pressure Octave Band Data, 60 HzUnit Octave Band & Center Frequency, Hz. Overall

Model 63 125 250 500 1000 2000 4000 8000 A-Weighted

125B 66 69 68 67 65 64 54 47 69140B 66 69 68 68 65 64 54 47 70155B 67 70 68 68 66 64 55 48 71170B 68 71 69 67 67 64 56 49 72175B 68 72 69 68 68 65 57 50 72185B 70 73 70 69 69 66 58 51 73195B 70 73 70 69 69 66 58 51 73204B 71 74 71 70 70 67 59 52 74220B 70 72 69 69 70 66 57 50 73235B 70 72 69 69 70 66 57 50 74250B 70 72 69 69 70 66 57 50 74265B 71 74 71 70 71 67 58 52 75280B 71 74 71 71 71 67 58 52 75300B 72 73 72 70 70 67 59 54 74315B 72 74 72 70 70 67 60 54 74330B 73 74 73 70 70 67 60 54 74340B 74 75 73 71 71 68 61 55 75360B 74 75 74 71 71 69 62 56 75370B 74 75 74 71 71 69 62 56 75380B 75 75 74 71 71 69 62 56 75425B 76 76 75 72 72 70 63 57 76

Note: Data at 30 feet (9 meters) from side of unit.

Table 12, Sound Power Octave Band Data, 60 HzUnit Octave Band & Center Frequency, Hz. Overall

Model 63 125 250 500 1000 2000 4000 8000 A-Weighted

125B 93 96 95 94 92 91 81 74 96140B 93 96 95 95 92 91 81 74 97155B 94 97 95 95 93 91 82 75 98170B 95 98 96 94 94 91 83 76 99175B 95 99 96 95 95 92 84 77 99185B 97 100 97 96 96 93 85 78 100195B 97 100 97 96 96 93 85 78 100204B 98 101 98 97 97 94 86 79 101220B 97 99 96 96 97 93 84 77 100235B 97 99 96 96 97 93 84 77 101250B 97 99 96 96 97 93 84 77 101265B 98 101 98 97 98 94 85 79 102280B 98 101 98 98 98 94 85 79 102300B 99 100 99 97 97 94 86 81 101315B 99 101 99 97 97 94 87 81 101330B 100 101 100 97 97 94 87 81 101340B 101 102 100 98 98 95 88 82 102360B 101 102 101 98 98 96 89 83 102370B 101 102 101 98 98 96 89 83 102380B 102 102 101 98 98 96 89 83 102425B 103 103 102 99 99 97 90 84 103

Note: Sound power octave band data, dB per ARI Standard 370.

annmariej


Sound Reduction Due to Distance from a UnitThe distance between a source of sound and the location of the sound measurement plays animportant role in minimizing sound problems. The equation below can be used to calculatethe sound pressure level at any distance if the sound power is known. Results for typicaldistances are tabulated in Table 13. Another way of determining the effect of distance is towork from sound pressure only. Figure 4 gives the reduction in sound pressure due todistance.

Sound pressure can be calculated at any distance from the unit if the sound power is known.

Lp=Lw-(20 log r) + (10 log Q) - .5

Lp = sound pressure

Lw = sound power

r = distance from unit in feet

Q = directionality factor

Table 13, dB Conversion of Sound Power to Pressure for DistanceDistance From Sound Source

ft (m)dB Reduction From Sound Power at the

Source to Sound Pressure30 (9) 27.150 (15) 31.675 (23) 35.1100 (30) 37.6150 (46) 41.1200 (61) 43.6300 (91) 47.6

Figure 4, Sound Pressure Attenuation Due to Distance from Unit

Air-Cooled Unit Orientation to Minimize SoundThe ALS chiller’s sound is directional in nature allowing the contractor/engineer to positionthe unit to minimize potential noise problems. Because the sound pressure levels are lowerat both ends of the unit than at the sides, the chiller should be oriented such that the controlbox end or end opposite the control box faces the direction where the lowest sound level isrequired.


The control box end provides an excellent acoustic barrier to the compressor sound as itcovers one full end of the unit. The sound pressure levels at the control box end will be 5dBA less than on the sides. On the end opposite the control box, the compressor sound isblocked by the coil structure, evaporator and naturally attenuated by distance as thecompressors are located approximately ¾ the length of the unit away from this end. Thesound pressure levels at the end opposite the control box will be 4 dBA less than on thesides.

Figure 5, Sound Directionality

Sound Pressure Levels, Low Ambient OperationAir-cooled unit operation below 95°F (35°C) will also result in lower sound pressure levels.The sound pressure level will decrease 1 dBA for ambient temperatures between 85-94°F(29.4-34.4°C), 2 dBA for ambient temperatures between 75-84°F (24-28.9°), and 3 dBA forambient temperatures between 65-74°F (18.3-23.3°C).

Sound Pressure Levels, Multiple UnitsMultiple air-cooled unit installations will have a higher sound level than a single unit on adoubling basis. Two units will have approximately 3 dB higher sound level of one unit, 4 unitswill be approximately 6 dB louder, and 8 units approximately 9 dB louder than one unit.

Sound Control, Air-Cooled UnitsWalls adjacent to a unit (20 feet {6.1meters} or less) will reflect soundoutwards, increasing the soundpressure on the side away from thewall. This sound increase could be ashigh as 3 dB for one wall and as highas 6 dB for a corner location. Unitorientation and/or distance as notedabove will decrease sound levels.Sound levels can also be controlled by the installation of barrier walls. To be effective assound blockers, walls must be solid with no open penetrations. Sound tends to leak out ofopenings. Block walls with filler material and slots on the side facing the unit are especiallyeffective. The wall should be about 10 feet high (two feet higher than the unit) and locatedat least 10 feet away so as not to affect unit performance. A three sided enclosure will bethe most effective solution and will reduce sound levels by about 10 dB. Remember that thewall will increase the sound level on the side opposite it by 3 to 6 dB (one or three sidedwall). Note: The effect of adjacent walls on air recirculation and restriction must always beconsidered when employing sound barrier walls. More complete information on soundattenuation can be found in Application Manual AM ALSWHS.

C

o

n

t

r

o

l

Compressor

Compressor

Sound pressure levels per Table

Sound pressure levels per Table

Sound pressure levelshere 4 dBA lowerthan Table

Sound pressure levelshere 5 dBA lowerthan Table Evaporator


Electrical Data

Table 14, ALS 125B – ALS 204B, Electrical Data, Single-PointPOWER SUPPLY FIELD FUSE SIZE or

FIELD WIRE HUB HACR BREAKER SIZEWIRE NOMINAL RECOM-

ALSUNITSIZE

VOLTS HZ

MINIMUMCIRCUITAMPACITY

(MCA) QTYGAUGE

QTYSIZE MENDED

MAXIMUM

208 598 6 350 2 2.5 700 800230 548 6 300 2 2.5 600 700

125B 380 60 331 3 400 1 3.0 400 450460 273 3 300 1 2.5 300 350575 221 3 4/0 1 2.0 250 300208 673 6 500 2 3.0 800 800230 616 6 350 2 2.5 700 800

140B 380 60 372 3 500 1 3.0 450 500460 307 3 350 1 2.5 400 400575 247 3 250 1 2.5 300 350208 745 6 500 2 3.0 800 1000230 682 6 500 2 3.0 800 800

155B 380 60 412 6 #4/0 2 2.0 500 500460 340 3 500 1 3.0 400 450575 273 3 300 1 2.5 300 350208 799 6 600 2 3.0 1000 1000230 730 6 500 2 3.0 800 1000

170B 380 60 441 6 #4/0 2 2.0 500 600460 364 3 500 1 3.0 450 500575 292 3 350 1 2.5 350 400208 810 6 600 2 3.0 1000 1000230 741 6 500 2 3.0 1000 1000

175B 380 60 448 6 250 2 2.5 500 600460 369 3 500 1 3.0 450 500575 296 3 350 1 2.5 350 400208* 853 6 600* 2 3.0 1000 1000230 779 6 600 2 3.0 1000 1000

185B 380 60 471 6 250 2 2.5 500 600460 388 6 #3/0 2 2.0 450 500575 311 3 400 1 2.5 350 400208* 853* 6 600* 2 3.0 1000 1000230 779 6 600 2 3.0 1000 1000

195B 380 60 471 6 250 2 2.5 500 600460 388 6 #3/0 2 2.0 450 500575 311 3 400 1 2.5 350 400208* 881* 6 600* 2 3.0 1000 1200230 779 6 600 2 3.0 1000 1000

204B 380 60 481 6 250 2 2.5 500 600460 399 6 #3/0 2 2.0 500 500575 321 3 400 1 2.5 400 400

NOTE: Table based on 75°C field wire except (*) which require 90°C field wire.


Table 15, ALS 220B – ALS 425B, Electrical Data, Single-PointPOWER SUPPLY FIELD FUSE SIZE or

FIELD WIRE HUB HACR BREAKER SIZE

WIRE NOMINAL RECOM-

ALSUNITSIZE

VOLTS HZ

MINIMUMCIRCUITAMPACITY

(MCA) QTYGAUGE

QTYSIZE MENDED

MAXIMUM

380 558 6 300 2 2.0 700 700220B 460 60 460 6 #4/0 2 2.0 500 500

575 370 6 #3/0 2 1.5 450 450380 597 6 350 2 2.5 700 700

235B 460 60 492 6 250 2 2.0 600 600575 395 6 #3/0 2 1.5 450 500380 626 6 400 2 2.5 700 800

250B 460 60 516 6 300 2 2.0 600 600575 414 6 #4/0 2 2.0 500 500380 649 6 400 2 2.5 800 800

265B 460 60 535 6 300 2 2.0 600 600575 429 6 #4/0 2 2.0 500 500380 672 6 500 2 3.0 800 800

280B 460 60 554 6 300 2 2.0 600 700575 555 6 #4/0 2 2.0 500 500380 723 6 500 2 3.0 800 800

300B 460 60 596 6 350 2 2.5 700 700575 481 6 250 2 2.0 500 500380 756 6 500 2 3.0 800 800

315B 460 60 623 6 400 2 2.5 700 700575 502 6 250 2 2.0 600 600380 789 6 600 2 3.0 800 800

330B 460 60 650 6 400 2 2.5 700 700575 523 6 300 2 2.0 600 600380 818 6 600 2 3.0 1000 1000

340B 460 60 674 6 500 2 3.0 800 800575 542 6 300 2 2.0 600 600380* 859 6 600 2 3.0 1000 1000

360B 460 60 707 6 500 2 3.0 800 800575 569 6 300 2 2.0 600 600380* 882 6 600 2 3.0 7000 7000

370B 460 60 726 6 500 2 3.0 800 800575 584 6 350 2 2.5 700 700380* 905 6 600 2 3.0 1000 1000

380B 460 60 745 6 500 2 3.0 800 800575 599 6 350 2 2.5 700 700380* 931 6 600 2 3.0 1000 1000

425B 460 60 770 6 600 2 3.0 800 800575 619 6 350 2 2.5 700 700

NOTE: Table based on 75°C field wire except (*) which require 90°C field wire.

annmariej


Table 16, ALS 125B – ALS 204B, Electrical Data, Multiple-PointELECTRICAL CIRCUIT #1 (COMP #1) ELECTRICAL CIRCUIT #2 (COMP #2)

POWER SUPPLY FIELD FUSING POWER SUPPLY FIELD FUSING

FIELD WIRE HUB FIELD WIRE HUBALSUNITSIZE

VOLTS HZMINIMUMCIRCUIT

AMPS(MCA) QTY

WIREGAUGE

QTYHUBSIZE

RECFUSESIZE

MAXFUSESIZE

MINIMUMCIRCUIT

AMPS(MCA) QTY

WIREGAUGE

QTYHUBSIZE

RECFUSESIZE

MAXFUSESIZE

208 329 3 400 1 3.0 400 500 329 3 400 1 3.0 400 500

230 301 3 350 1 2.5 400 500 301 3 350 1 2.5 400 500

125B 380 60 182 3 #3/0 1 2.0 225 300 182 3 #3/0 1 2.0 225 300

460 150 3 #1/0 1 1.5 200 250 150 3 #1/0 1 1.5 200 250

575 122 3 #1 1 1.5 150 200 122 3 #1 1 1.5 150 200

208 329 3 400 1 3.0 400 500 404 6 #4/0 2 2.0 500 700

230 301 3 350 1 2.5 400 500 369 3 500 1 3.0 500 600

140B 380 60 182 3 #3/0 1 2.0 225 300 223 3 #4/0 1 2.0 300 350

460 150 3 #1/0 1 1.5 200 250 184 3 #3/0 1 2.0 250 300

575 122 3 #1 1 1.5 150 200 148 3 #1/0 1 1.5 200 250

208 410 6 #4/0 2 2.0 500 700 410 6 #4/0 2 2.0 500 700

230 375 3 500 1 3.0 500 600 375 3 500 1 3.0 500 600

155B 380 60 226 3 #4/0 1 2.0 300 350 226 3 #4/0 1 2.0 300 350

460 187 3 #3/0 1 2.0 250 300 187 3 #3/0 1 2.0 250 300

575 150 3 #1/0 1 1.5 200 250 150 3 #1/0 1 1.5 200 250

208 410 6 #4/0 2 2.0 500 700 464 6 250 2 2.5 600 800

230 375 3 500 1 3.0 500 600 423 6 #4/0 2 2.0 500 700

170B 380 60 226 3 #4/0 1 2.0 300 350 255 3 300 1 2.5 350 400

460 187 3 #3/0 1 2.0 250 300 211 3 #4/0 1 2.0 250 350

575 150 3 #1/0 1 1.5 200 250 169 3 #2/0 1 1.5 225 250

208 416 6 #4/0 2 2.0 500 700 470 6 250 2 2.5 600 800

230 381 6 #3/0 2 2.0 500 600 429 6 #4/0 2 2.0 500 700

175B 380 60 230 3 #4/0 1 2.0 300 350 259 3 300 1 2.5 350 400

460 190 3 #3/0 1 2.0 250 300 214 3 #4/0 1 2.0 250 350

575 152 3 #2/0 1 1.5 200 250 171 3 #2/0 1 1.5 225 250

208 470 6 250 2 2.5 600 800 470 6 250 2 2.5 600 800

230 429 6 #4/0 2 2.0 500 700 429 6 #4/0 2 2.0 500 700

185B 380 60 259 3 300 1 2.5 350 400 259 3 300 1 2.5 350 400

460 214 3 #4/0 1 2.0 250 350 214 3 #4/0 1 2.0 250 350

575 171 3 #2/0 1 1.5 225 250 171 3 #2/0 1 1.5 225 250

208 470 6 250 2 2.5 600 800 470 6 250 2 2.5 600 800

230 429 6 #4/0 2 2.0 500 700 429 6 #4/0 2 2.0 500 700

195B 380 60 259 3 300 1 2.5 350 400 259 3 300 1 2.5 350 400

460 214 3 #4/0 1 2.0 250 350 214 3 #4/0 1 2.0 250 350

575 171 3 #2/0 1 1.5 225 250 171 3 #2/0 1 1.5 225 250

208 484 6 250 2 2.5 700 800 484 6 250 2 2.5 700 800

230 439 6 #4/0 2 2.0 600 700 439 6 #4/0 2 2.0 600 700

204B 380 60 284 3 300 1 2.5 400 450 264 3 300 1 2.5 400 450

460 219 3 #4/0 1 2.0 300 350 219 3 #4/0 1 2.0 300 350

575 176 3 #3/0 1 2.0 250 300 176 3 #3/0 1 2.0 250 300

NOTE: Table based on 75°C field wire


Table 17, ALS 220B – ALS 280B, Electrical Data, Multiple-Point(Circuit #3 on following page)

ELECTRICAL CIRCUIT #1 (COMP #1) ELECTRICAL CIRCUIT #2 (COMP #2)

MINIMUM POWER SUPPLY FIELD FUSING MINIMUM POWER SUPPLY FIELD FUSING

CIRCUIT FIELD WIRE HUB REC MAX CIRCUIT FIELD WIRE HUB REC MAX

AMPS WIRE HUB FUSE FUSE AMPS WIRE HUB FUSE FUSE

ALSUNITSIZE

VOLTS HZ

(MCA)QTY

GAUGEQTY

SIZE SIZE SIZE (MCA)QTY

GAUGEQTY

SIZE SIZE SIZE

208 329 3 400 1 2.5 400 500 410 6 300 1 3 600 700

230 302 3 350 1 2.5 400 500 375 6 250 1 3 500 600

220B 380 60 182 3 #3/0 1 1.5 250 300 223 3 #4/0 1 2 300 350

460 150 3 #1/0 1 1.25 200 250 187 3 #3/0 1 1.5 250 300

575 122 3 #1/0 1 1.25 175 200 150 3 #1/0 1 1.25 200 250

208 410 6 300 1 3 600 700 410 6 300 1 3 600 700

230 375 3 250 1 3 500 600 375 6 250 1 3 500 600

235B 380 60 227 3 #4/0 1 2 300 350 227 3 #4/0 1 2 300 350

460 187 3 #3/0 1 1.5 250 300 187 3 #3/0 1 1.5 250 300

575 150 3 #1/0 1 1.25 200 250 150 3 #1/0 1 1.25 200 250

208 410 6 300 1 3 600 700 410 6 300 1 3 600 700

230 375 3 250 1 3 500 600 375 6 250 1 3 500 600

250B 380 60 227 3 #4/0 1 2 300 350 227 3 #4/0 1 2 300 350

460 187 3 #3/0 1 1.5 250 300 187 3 #3/0 1 1.5 250 300

575 150 3 #1/0 1 1.25 200 250 150 3 #1/0 1 1.25 200 250

208 416 6 300 1 3 600 700 464 6 350 1 3.5 700 800

230 375 6 250 1 3 500 600 423 6 300 1 3 600 700

265B 380 60 2270 3 #4/0 1 2 300 350 259 3 250 1 2 350 400

460 187 3 #3/0 1 1.5 250 300 211 3 #4/0 1 2 300 350

575 150 3 #1/0 1 1.25 200 250 170 3 #2/0 1 1.5 250 250

208 464 6 350 1 3.5 700 800 464 6 350 1 3.5 700 800

230 423 6 300 1 3 600 700 423 6 300 1 3 600 700

280B 380 60 256 3 250 1 2 350 400 256 3 250 1 2 350 400

460 211 3 #4/0 1 2 300 350 211 3 #4/0 1 2 300 350

575 170 3 #2/0 1 1.5 250 250 170 3 #2/0 1 1.5 250 250



Table 17, Electrical Data, ALS 220B - 280B, (Circuit #3)ELECTRICAL CIRCUIT #3 (COMP #3)

MINIMUM POWER SUPPLY FIELD FUSING

CIRCUIT FIELD WIRE HUB REC MAX

AMPS WIRE HUB FUSE FUSE

ALSUNITSIZE

VOLTS HZ

(MCA)QTY

GAUGEQTY

SIZE SIZE SIZE

208 410 6 300 1 3.0 600 700

230 375 6 250 1 3.0 500 600

220B 380 60 227 3 #4/0 1 2.0 300 350

460 187 3 #3/0 1 1.5 250 300

575 150 3 #1/0 1 1.25 200 250

208 410 6 300 1 3.0 600 700

230 375 6 250 1 3.0 500 600

235B 380 60 227 3 #4/0 1 2.0 300 350

460 187 3 #3/0 1 1.5 250 300

575 150 3 #1/0 1 1.25 200 250

208 464 6 350 1 3.5 700 800

230 423 6 300 1 3.0 600 700

250B 380 60 256 3 250 1 2.0 350 400

460 211 3 #4/0 1 2.0 300 350

575 170 3 #2/0 1 1.5 250 250

208 464 6 350 1 3.5 700 800

230 423 6 300 1 3.0 600 700

265B 380 60 256 3 250 1 2.0 350 400

460 211 3 #4/0 1 2.0 300 350

575 170 3 #2/0 1 1.5 250 250

208 464 6 350 1 3.5 700 800

230 423 6 300 1 3.0 600 700

280B 380 60 256 3 250 1 2.0 350 400

460 211 3 #4/0 1 2.0 300 350

575 170 3 #2/0 1 1.5 250 250


Table 18, ALS 300B – ALS 425B, Electrical Data, Multiple-PointELECTRICAL CIRCUIT #1 (COMP #1 & 3) ELECTRICAL CIRCUIT #2 (COMP #2 & 4)

MINIMUM POWER SUPPLY FIELD FUSING MINIMUM POWER SUPPLY FIELD FUSING

CIRCUIT FIELD WIRE HUB REC MAX CIRCUIT FIELD WIRE HUB REC MAX

AMPS WIRE HUB FUSE FUSE AMPS WIRE HUB FUSE FUSE

ALSUNITSIZE

VOLTS HZ

(MCA)QTY

GAUGEQTY

SIZE SIZE SIZE (MCA)QTY

GAUGEQTY

SIZE SIZE SIZE

208 693 6 500 2 3.0 800 800 693 6 500 2 3.0 800 800230 630 6 400 2 2.5 800 800 630 6 400 2 2.5 800 800

300B 380 60 382 6 250 1 3.0 450 500 382 6 250 1 3.0 450 500460 315 3 400 1 2.5 400 450 315 3 400 1 2.5 400 450575 254 3 250 1 2.0 350 350 254 3 250 1 2.0 350 350

208 693 6 500 2 3.0 800 800 753 6 500 2 3.0 1000 1000230 630 6 400 2 2.5 800 800 684 6 400 2 3.0 800 800

315B 380 60 382 6 250 1 3.0 450 500 415 6 300 1 3.0 500 500460 315 3 400 1 2.5 400 450 342 3 400 1 3.0 400 450575 254 3 250 1 2.0 350 350 275 3 250 1 2.0 350 350

208 753 6 500 2 3.0 1000 1000 753 6 500 2 3.0 1000 1000230 684 6 500 2 3.0 800 800 684 6 500 2 3.0 800 800

330B 380 60 415 6 300 1 3.0 500 500 415 6 300 1 3.0 500 500460 342 3 500 1 3.0 400 450 342 3 500 1 3.0 400 450575 275 3 300 1 2.0 350 350 275 3 300 1 2.0 350 350

208 753 6 500 2 3.0 1000 1000 807 6 600 2 3.0 1000 1000230 684 6 500 2 3.0 800 800 732 6 500 2 3.0 1000 1000

340B 380 60 415 6 300 1 3.0 500 500 444 6 300 1 3.0 500 600460 342 3 500 1 3.0 400 450 366 3 500 1 3.0 450 500575 275 3 300 1 2.0 350 350 294 3 350 1 2.5 350 400

208 822 6 400 2 3.0 1000 1000 822 6 600 2 3.0 1000 1000230 746 6 500 2 3.0 1000 1000 746 6 500 2 3.0 1000 1000

360B 380 60 453 6 300 1 3.0 500 600 453 6 300 1 3.0 500 600460 373 3 500 1 3.0 450 500 373 3 500 1 3.0 450 500575 300 3 350 1 2.5 400 400 300 3 350 1 2.5 400 400

208 822 6 600 2 3.0 1000 1000 865 6 600 2 3.0 1000 1000230 746 6 500 2 3.0 1000 1000 784 6 600 2 3.0 1000 1000

370B 380 60 453 6 300 1 3.0 500 600 476 6 350 1 3.5 500 600460 373 3 500 1 3.0 450 500 392 3 600 1 3.0 450 500575 300 3 350 1 2.5 400 400 315 3 400 1 2.5 400 400

208 865 6 600 2 3.0 1000 1000 865 6 600 2 3.0 1000 1000230 784 6 600 2 3.0 1000 1000 784 6 600 2 3.0 1000 1000

380B 380 60 476 6 350 1 3.5 500 600 476 6 350 1 3.5 500 600460 392 3 600 1 3.0 450 500 392 3 600 1 3.0 450 500575 315 3 400 1 2.5 400 400 315 3 400 1 2.5 400 400

208 892 6 600 2 3.0 1200 1200 892 6 600 2 3.0 1200 1200230 808 6 600 2 3.0 1000 1000 808 6 600 2 3.0 1000 1000

425B 380 60 489 6 350 1 3.0 500 600 489 6 350 1 3.0 600 600460 404 3 600 1 3.0 500 500 404 3 600 1 3.0 500 500575 325 3 400 1 2.5 400 400 325 3 400 1 2.5 400 400


annmariej


Table 19, ALS125B – ALS 204B, Compressor and Condenser Fan Motor Amp DrawRATED LOAD AMPS LOCKED ROTOR AMPS

PER COMPRESSORALS

UNITSIZE

VOLTS HZ CIRCUIT #1 CIRCUIT #2

FANMOTORS

FLA(EACH)

NO OFFAN

MOTORS

FANMOTORS(EACH) ACROSS-THE-LINE REDUCED INRUSH

208 240 240 5.8 10 23.7 1459 934230 218 218 5.8 10 21.4 1628 1042

125B 380 60 132 132 3.4 10 14.4 943 604460 109 109 2.8 10 10.7 764 489575 88 88 2.3 10 11.5 589 377208 240 300 5.8 10 23.7 1459 934230 218 272 5.8 10 21.4 1628 1042

140B 380 60 132 165 3.4 10 14.4 943 604460 109 136 2.8 10 10.7 764 489575 88 109 2.3 10 11.5 589 377208 300 300 5.8 12 23.7 1459 934230 272 272 5.8 12 21.4 1628 1042

155B 380 60 165 165 3.4 12 14.4 943 604460 136 136 2.8 12 10.7 764 489575 109 109 2.3 12 11.5 589 377208 300 343 5.8 12 23.7 1459 934230 272 310 5.8 12 21.4 1628 1042

170B 380 60 165 188 3.4 12 14.4 943 604460 136 155 2.8 12 10.7 764 489575 109 124 2.3 12 11.5 589 377208 300 343 5.8 14 23.7 1459 934230 272 310 5.8 14 21.4 1628 1042

175B 380 60 165 188 3.4 14 14.4 943 604460 136 155 2.8 14 10.7 764 489575 109 124 2.3 14 11.5 589 377208 343 343 5.8 14 23.7 1459 934230 310 310 5.8 14 21.4 1628 1042

185B 380 60 188 188 3.4 14 14.4 943 604460 155 155 2.8 14 10.7 764 489575 124 124 2.3 14 11.5 589 377208 343 343 5.8 14 23.7 1459 934230 310 310 5.8 14 21.4 1628 1042

195B 380 60 188 188 3.4 14 14.4 943 604460 155 155 2.8 14 10.7 764 489575 124 124 2.3 14 11.5 589 377208 343 343 7.8 14 30.5 1459 934230 310 310 7.2 14 27.6 1628 1042

204B 380 60 188 188 4.1 14 20.0 943 604460 155 155 3.6 14 13.8 764 489575 124 124 3.0 14 11.5 589 377


Table 20, ALS 220B – ALS 280B, Compressor and Condenser Fan Motor Amp DrawRATED LOAD AMPS LOCKED ROTOR AMPS

COMPRESSORS PER COMPRESSORALS

UNITSIZE

VOLTS HZNO. 1 NO. 2 NO. 3

FANMOTORS

FLA(EACH)

NO OFFAN

MOTORS


208 240 300 300 5.8 16 23.7 1459 934

230 218 272 272 5.8 16 21.4 1628 1042220B 380 60 132 165 165 3.4 16 14.4 943 604

460 109 136 136 2.8 16 10.7 764 489575 88 109 109 2.3 16 11.5 589 377

208 300 300 300 5.8 18 23.7 1459 934230 272 272 272 5.8 18 21.4 1628 1042

235B 380 60 165 165 165 3.4 18 14.4 943 604460 136 136 136 2.8 18 10.7 764 489

575 109 109 109 2.3 18 11.5 589 377

208 300 300 343 5.8 18 23.7 1459 934

230 272 272 310 5.8 18 21.4 1628 1042250B 380 60 165 165 188 3.4 18 14.4 943 604

460 136 136 155 2.8 18 10.7 764 489575 109 109 124 2.3 18 11.5 589 377

208 300 343 343 5.8 18 23.7 1459 934230 272 310 310 5.8 18 21.4 1628 1042

265B 380 60 165 188 188 3.4 18 14.4 943 604460 136 155 155 2.8 18 10.7 764 489

575 109 124 124 2.3 18 11.5 589 377

208 343 343 343 5.8 18 23.7 1459 934

230 310 310 310 5.8 18 21.4 1628 1042280B 380 60 188 188 188 3.4 18 14.4 943 604

460 155 155 155 2.8 18 10.7 764 489575 124 124 124 2.3 18 11.5 589 377


Table 21, ALS 300B – ALS 425B, Compressor and Condenser Fan Motor Amp DrawRATED LOAD AMPS LOCKED ROTOR AMPS

COMPRESSORS PER COMPRESSORALS

UNITSIZE

VOLTS HZ

NO 1 NO 2 NO 3 NO 4

FANMOTORS

FLA(EACH)

NO OFFAN

MOTORS


208 240 240 300 300 7.8 20 30.5 1459 934230 218 218 272 272 7.2 20 27.6 1628 1042

300B 380 60 132 132 165 165 4.1 20 20.0 943 604460 109 109 136 136 3.6 20 13.8 764 489

575 88 88 109 109 3.0 20 11.5 589 377

208 240 300 300 300 7.8 20 30.5 1459 934

230 218 272 272 272 7.2 20 27.6 1628 1042315B 380 60 132 165 165 165 4.1 20 20.0 943 604

460 109 136 136 136 3.6 20 13.8 764 489575 88 109 109 109 3.0 20 11.5 589 377

208 300 300 300 300 7.8 20 30.5 1459 934230 272 272 272 272 7.2 20 27.6 1628 1042

330B 380 60 165 165 165 165 4.1 20 20.0 943 604460 136 136 136 136 3.6 20 13.8 764 489

575 109 109 109 109 3.0 20 11.5 589 377

208 300 300 300 343 7.8 20 30.5 1459 934

230 272 272 272 310 7.2 20 27.6 1628 1042340B 380 60 165 165 165 188 4.1 20 20.0 943 604

460 136 136 136 155 3.6 20 13.8 764 489575 109 109 109 124 3.0 20 11.5 589 377

208 300 300 343 343 7.8 24 30.5 1459 934230 272 272 310 310 7.2 24 27.6 1628 1042

360B 380 60 165 165 188 188 4.1 24 20.0 943 604460 136 136 155 155 3.6 24 13.8 764 489

575 109 109 124 124 3.0 24 11.5 589 377

208 300 343 343 343 7.8 24 30.5 1459 934

230 272 310 310 310 7.2 24 27.6 1628 1042370B 380 60 165 188 188 188 4.1 24 20.0 943 604

460 136 155 155 155 3.6 24 13.8 764 489575 109 124 124 124 3.0 24 11.5 589 377

208 343 343 343 343 7.8 24 30.5 1459 934230 310 310 310 310 7.2 24 27.6 1628 1042

380B 380 60 188 188 188 188 4.1 24 20.0 943 604460 155 155 155 155 3.6 24 13.8 764 489

575 124 124 124 124 3.0 24 11.5 589 377

208 343 343 343 343 10.0 24 48.1 1459 934230 310 310 310 310 9.2 24 43.5 1628 1042

425B 380 60 188 188 188 188 5.5 24 26.4 943 604460 155 155 155 155 4.6 24 21.8 764 489575 124 124 124 124 3.8 24 17.4 589 377

annmariej


Table 22, ALS 125B – ALS 204B, Customer Wiring Information With Single-Point Power

WIRING TO STANDARD UNIT POWER BLOCK WIRING TO OPTIONAL NONFUSEDDISCONNECT SWITCH IN UNIT

TERMINAL SIZE CONNECTOR WIRE RANGE CONNECTOR WIRE RANGE

ALSUNITSIZE

VOLTS HZ

AMPS (COPPER WIRE ONLY)SIZE

(COPPER WIRE ONLY)

208 840 (2) #2 to 600 MCM - See Note 9230 840 (2) #2 to 600 MCM - See Note 9

125B 380 60 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM460 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM575 840 (2) #2 to 600 MCM 250 (1) #4 to 350 MCM208 840 (2) #2 to 600 MCM - See Note 9230 840 (2) #2 to 600 MCM - See Note 9

140B 380 60 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM460 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM575 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM208 840 (2) #2 to 600 MCM - See Note 9230 840 (2) #2 to 600 MCM - See Note 9






204B 380 60 840 (2) #2 to 600 MCM 600 (2) 250 to 500 MCM460 840 (2) #2 to 600 MCM 600 (2) 250 to 500 MCM575 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM


Table 23, ALS 220B – ALS 425B, Customer Wiring Information with Single-Point Power

WIRING TO STANDARD UNIT POWER BLOCK WIRING TO OPTIONAL NONFUSEDDISCONNECT SWITCH IN UNIT

TERMINAL SIZE CONNECTOR WIRE RANGE CONNECTOR WIRE RANGE

ALSUNITSIZE

VOLTS HZ

AMPS (COPPER WIRE ONLY) SIZE (COPPER WIRE ONLY)

380 840 (2) #2 to 600 MCM 600 (2) 250 to 500 MCM220B 460 60 840 (2) #2 to 600 MCM 600 (2) 250 to 500 MCM

575 840 (2) #2 to 600 MCM 400 (1) 250 to 500 MCM380 840 (2) #2 to 600 MCM 800 (2) 500 to 750 MCM












425B 460 60 840 (2) #2 to 600 MCM 1200 (3) 500 to 750 MCM575 840 (2) #2 to 600 MCM 800 (2) 400 to 700 MCM

annmariej


Table 24, ALS 125B – ALS 204B, Customer Wiring Informationwith Multiple-Point Power

WIRING TO UNIT POWER BLOCK

POWER BLOCK

TERMINAL SIZE (AMPS) CONNECTOR WIRE RANGE (COPPER WIRE ONLY)

ALSUNITSIZE

VOLTS HZ

CKT 1 CKT 2 CKT 1 CKT 2

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

125B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM


208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM140B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

155B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

170B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

175B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

185B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

195B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

204B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM





TERMINBAL SIZE (AMPS) CONNECTOR WIRE RANGE (COPPER WIRE ONLY)ALS UNIT

SIZEVOLTS HZ

CKT 1 CKT 2 CKT 3 CKT 1 CKT 2 CKT 3

208 840 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM (2) #2 to 600 MCM


220B 380 60 840 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM (2) #2 to 600 MCM


























POWER BLOCK

TERMINAL SIZE (AMPS) CONNECTOR WIRE RANGE (COPPER WIRE ONLY)UNITSIZE VOLTS HZ

ELEC CIRC #1 ELEC CIRC #2 ELEC CIRC #1 ELEC CIRC #2


300B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM








360B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM370B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM


208 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

230 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

380B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM


425B 380 60 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM460 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

575 840 840 (2) #2 to 600 MCM (2) #2 to 600 MCM

annmariej


Electrical Data Notes1. Allowable voltage limits

Unit nameplate 208V/60Hz/3PH: 187V to 229VUnit nameplate 230V/60Hz/3Ph: 207V to 253VUnit nameplate 380V/60Hz/3Ph: 342V to 418VUnit nameplate 460V/60Hz/3Ph: 414V to 506VUnit nameplate 575V/60Hz/3Ph: 517V to 633V

2. Unit wire size ampacity (MCA) is equal to 125% of the largest compressor-motor RLAplus 100% of RLA of all other loads in the circuit including control transformer. Wiresize ampacity for separate 115V control circuit power is 15 amps for ALS125B throughALS280B.

3. Compressor RLA values are for wire sizing purposes only but do reflect normaloperating current draw at unit rated capacity. If unit is equipped with SpeedTrolcondenser fan motors, the first motor on each refrigerant circuit is a single phase, 1 hpmotor, with a FLA of 2.8 amps at 460 volts (5.6 amps at 208/230 volts). If the unit isnot equipped with SpeedTrol, the standard fan motor will be 1 1/2 hp, 3-phase (forALS125B-280B except ALS204 which will be 2 hp, 3-phase) with FLA as shown inthe electrical tables. For ALS300B-380B the standard fan motor will be 2 hp, 3-phaseand for ALS425B fan motor will be 2.5 hp, 3-phase.

4. Compressor LRA for reduced inrush start is for the first winding. If the unit is equippedwith SpeedTrol motors, the first motor on each refrigerant circuit is a single phase, 1 hpmotor, with a LRA of 7.3 amps at 460 volts (14.5 amps at 208/230 volts). If the unit isnot equipped with SpeedTrol, the standard fan motor will be 1 1/2 hp, 3-phase with aLRA as shown in the electrical tables.

5. Single point power supply requires a single disconnect to supply electrical power to theunit. This power must be fused.

6. Multiple point power supply requires two independent power circuits on ALS125B-ALS204B, ALS300-ALS425 and three independent power circuits on ALS220B-ALS280B each with separate fused disconnects and a separate control circuit.

7. All field wiring to unit power block or optional nonfused disconnect switch must becopper.

8. Field wire size values given in tables apply to 75°C rated wire per NEC except forALS185B-ALS204B and ALS370B, ALS380B, ALS425B for 208V application or asnoted.

9. External disconnect switch(s) or HACR breakers must be field supplied. Note : Onsingle point power units a non-failure disconnect switch in the cabinet is available as anoption.

10. All wiring must be done in accordance with applicable local and national codes.11. Recommended time delay fuse size or HACR circuit breakers is equal to 150% of the

largest compressor motor RLA plus 100% of remaining compressor RLAs and the sumof condenser fan FLAs.

12. Maximum time delay fuse size or HACR circuit breakers is equal to 225% of the largestcompressor-motor RLA plus 100% of remaining compressor RLAs and the sum ofcondenser fan FLAs.


Field Wiring Diagram

Figure 6, Typical Field Wiring Diagram


Physical Data

Table 27, Physical Data, ALS 125B – ALS 170BALS MODEL NUMBER

DATA 125B 140B 155B 170BCkt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2

BASIC DATAUnit Cap. @ ARI Conditions, tons

(kW)123.0 (433) 138.0 (486) 154.0 (542) 168.0 (591)

Unit Operating Charge R-22, lbs (kg) 140 (63.5) 140 (63.5) 140 (63.5) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 160 (72.6)Cabinet DimensionsL x W x H, in. (mm)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

228.7 x 83.4 x 92.5(5809 x 2118 x 2350)

Unit Operating Weight, lbs. (kg) 9920 (4500) 10350 (4700) 10670 (4840) 10750 (4880)Unit Shipping Weight, lbs (kg) 9600 (4355) 9900 (4490) 10250 (4650) 10350 (4700)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity, tons (kW) 65 (230) 65 (230) 65 (230) 80 (280) 80 (280) 80 (280) 80 (280) 90 (335)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft. (m2) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7)

Finned Height x Finned Length ft. (mm)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3CONDENSER FANS, DIRECT DRIVE PROPELLER TYPENo. of Fans -- Fan Diameter, in. (mm) 10 - 28 (711) 10 - 28 (711) 12 - 28 (711) 12 - 28 (711)

No. of Motors -- hp (kW) 10 - 1.5 (1.1) 10 - 1.5 (1.1) 12 - 1.5 (1.1) 12 - 1.5 (1.1)Fan & Motor RPM, 60Hz 1140 1140 1140 1140

60 Hz Fan Tip Speed, fpm 8357 8357 8357 835760 Hz Total Unit Airflow, ft3/sec 90200 90200 108240 108240

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL AND THROUGH TUBEShell Dia.-Tube Length

in.(mm) - ft. (mm)14 - 10

(356 - 3048)16 - 10

(406 - 3048)16 - 10

(406 - 3048)16 - 10

(406 - 3048)Water Volume, gallons (liters) 36.1 (136.7) 45.6 (172.6) 43.6 (165.0) 43.6 (165.0)

Max. Water Pressure, psi (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)Max. Refrigerant Pressure, psi (kPa) 300 (2068) 300 (2068) 300 (2068) 300 (2068)


DATA 175B 185B 195B 204BCkt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2 Ckt 1 Ckt 2


(kW)170.0 (598) 182.0 (641) 188.0 (662) 202.0 (711)

Unit Operating Charge R-22, lbs (kg) 160 (72.6) 160 (72.6) 160 (72.6) 160 (72.6) 170 (77.1) 170 (77.1) 195 (88.4) 195 (88.4)Cabinet Dimensions,L x W x H, in. (mm)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

263.4 x 83.4 x 92.5(6690 x 2118 x 2350)

Unit Operating Weight, lbs. (kg) 11250 (5100) 11250 (5100) 11500 (5218) 12570 (5701)Unit Shipping Weight, lbs (kg) 10850 (4920) 10850 (4920) 11100 (5036) 11980 (5433)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity, tons (kW) 80 (280) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft. (m2) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5) 135.0 (12.5)

Finned Height x Finned Lengthft. (mm)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

80 x 243(2032 x 6172)

Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 12 x 4 12 x 4CONDENSER FANS, DIRECT DRIVE PROPELLER TYPENo. of Fans -- Fan Diameter, in. (mm) 14 - 28 (711) 14 - 28 (711) 14 - 28 (711) 14 - 28 (711)

No. of Motors -- hp (kW) 14 - 1.5 (1.1) 14 - 1.5 (1.1) 14 - 1.5 (1.1) 14 - 2.0 (1.5)Fan & Motor RPM, 60Hz 1140 1140 1140 1140

50 Hz Fan Tip Speed, fpm 8357 8357 8357 835750 Hz Total Unit Airflow, ft3/sec 126280 126280 126280 138908

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL AND THROUGH TUBEShell Dia. -- Tube Length

in.(mm) - ft. (mm)16 - 10

(406 - 3048)16 - 10

(406 - 3048)18 - 10

(457 - 3048)20 - 10

(508 -3048)Water Volume, gallons (liters) 43.6 (165.0) 43.6 (165.0) 57.3 (216.9) 69.6 (263.5)


Max. Water Pressure, psi (kPa) 175 (1207) 175 (1207) 175 (1207) 175 (1207)Max. Refrigerant Pressure, psi (kPa) 300 (2068) 300 (2068) 300 (2068) 300 (2068)


DATA 220B 235B 250BCKT. 1 CKT. 2 CKT. 3 CKT. 1 CKT. 2 CKT. 3 CKT. 1 CKT. 2 CKT. 3


(kW)223.0- (785 237.0 (834) 250.0 (880)

Unit Operating Charge R-22, lbs (kg) 140 (63.5) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 150 (68.1) 160 (72.6)Cabinet Dimensions, L x W x H, in.

(mm)355 x 83.4 x 94.5

(9017 x 2118 x 2400)355 x 83.4 x 94.5

(9017 x 2118 x 2400)355 x 83.4 x 94.5

(9017 x 2118 x 2400)Unit Operating Weight, lbs. (kg) 15980 (7247) 16180 (7338) 16200 (7347)Unit Shipping Weight, lbs (kg) 15330 (6952) 15530 (7043) 15600 (7075)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity, tons (kW) 65 (230) 80 (280) 80 (280) 80 (280) 80 (280) 80 (280) 80 (280) 80 (280) 95 (335)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft. (m2) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7)


80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

160 x 104(4064 x 2642)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

160 x 104(4064 x 2642)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

160 x 104(4064 x 2642)

Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3CONDENSER FANS, DIRECT DRIVE PROPELLER TYPENo. of Fans -- Fan Diameter, in. (mm) 16 - 28 (711) 18 - 28 (711) 18 - 28 (711)

No. of Motors -- hp (kW) 16 - 1.5 (1.1) 18 - 1.5 (1.1) 18 - 1.5 (1.1)Fan & Motor RPM, 60Hz 1140 1140 1140

60 Hz Fan Tip Speed, fpm 8357 8357 835760 Hz Total Unit Airflow, ft3/sec 144320 162360 162360

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL AND THROUGH TUBEShell Dia. -- Tube Length

in.(mm) - ft. (mm)20 - 10

(508 - 3048)20 - 10

(508 - 3048)20 - 10

(508 - 3048)Water Volume, gallons (liters) 76 (287.7) 76 (287.7) 69.6 (263.5)

Max. Water Pressure, psi (kPa) 175 (1207) 175 (1207) 175 (1207)Max. Refrigerant Pressure, psi (kPa) 300 (2068) 300 (2068) 300 (2068)


DATA 265B 280BCKT. 1 CKT. 2 CKT. 3 CKT. 1 CKT. 2 CKT. 3


(kW)260.0 (915) 272.0 (957)

Unit Operating Charge R-22, lbs (kg) 150 (68.1) 160 (72.6) 160 (72.6) 160 (72.6) 160 (72.6) 160 (72.6)Cabinet Dimensions, L x W x H, in.

(mm)355 x 83.4 x 94.5

(9017 x 2118 x 2400)355 x 83.4 x 94.5

(9017 x 2118 x 2400)Unit Operating Weight, lbs. (kg) 16200 (7347) 16250 (7370)Unit Shipping Weight, lbs (kg) 15600 (7075) 15650 (7098)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity, tons (kW) 80 (280) 95 (335) 95 (335) 95 (335) 95 (335) 95 (335)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft. (m2) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7) 115.6 (10.7)


80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

160 x 104(4064 x 2642)

80 x 208(2032 x 5283)

80 x 208(2032 x 5283)

160 x 104(4064 x 2642)

Fins Per Inch x Rows Deep 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3 16 x 3CONDENSER FANS, DIRECT DRIVE PROPELLER TYPENo. of Fans -- Fan Diameter, in. (mm) 18 - 28 (711) 18 - 28 (711)

No. of Motors -- hp (kW) 18 - 1.5 (1.1) 18 - 1.5 (1.1)Fan & Motor RPM, 60Hz 1140 114060 Hz Fan Tip Speed, fpm 8357 8357

60 Hz Total Unit Airflow, ft3/sec 162360 162360EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL AND THROUGH TUBE

Shell Dia. -- Tube Lengthin.(mm) - ft. (mm)

20 - 10(508 - 3048)

20 - 10(508 - 3048)

Water Volume, gallons (liters) 69.6 (263.5) 69.6 (263.5)


Max. Water Pressure, psi (kPa) 175 (1207) 175 (1207)Max. Refrigerant Pressure, psi (kPa) 300 (2068) 300 (2068)


Table 31, Physical Date, ALS 300B – ALS 340BALS MODEL NUMBER

DATA 300B 315B 330B 340BCkt 1 Ckt 2 Ckt 3 Ckt 4 Ckt 1 Ckt 2 Ckt 3 Ckt 4 Ckt 1 Ckt 2 Ckt 3 Ckt 4 Ckt 1 Ckt 2 Ckt 3 Ckt 4

BASIC DATAUnit Capacity @ ARIConditions, tons (kW)

293.0 (1031) 305.0 (1074) 319.0 (1123) 328.0 (1155)

Unit Operating ChargeR-22, lbs (kg)

155(70.3)

155(70.3)

160(72.6)

160(72.6)

155(70.3)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

160(72.6)

170(77.1)

Cabinet Dimensions,L x W x H, in. (mm)

389.7 x 83.4 x 94.5(9898 x 2118 x 2400)

389.7 x 83.4 x 94.5(9898 x 2118 x 2400)

389.7 x 83.4 x 94.5(9898 x 2118 x 2400)

389.7 x 83.4 x 94.5(9898 x 2118 x 2400)

Operating Wt., lbs (kg) 21250 (9637) 21250 (9637) 21320 (9669) 21320 (9669)Shipping Wt., lbs (kg) 20300 (9206) 20300 (9206) 20400 (9252) 20400 (9252)COMPRESSORS, SCREW, SEMI-HERMETIC

Nominal Capacity,tons (kW)

65(230)

65(230)

80(280)

80(280)

65(230)

80(280)

80(280)

80(280)

80(280)

80(280)

80(280)

80(280)

80(280)

80(280)

80(280)

80(280)

CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLERCoil Face Area, ft.

(m2)96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

96.3(8.9)

Finned Height xFinned Length ft.

(mm)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

80x173(2032x4394)

Fins Per Inch x Rows 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4CONDENSER FANS, DIRECT DRIVE PROPELLER TYPE

Fan Qty., Dia. in.(mm)

20 – 28 (711) 20 - 28 (711) 20 – 28 (711) 20 - 28 (711)

No. of Motors, hp(kW)

20 - 2.0 (1.5) 20 - 2.0 (1.5) 20 - 2.0 (1.5) 20 - 2.0 (1.5)

Fan & Motor RPM 1140 1140 1140 1140Fan Tip Speed, fpm 8357 8357 8357 8357Unit Airflow, ft3/sec 198440 198440 198440 198440

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL AND THROUGH TUBEShell Dia. -- Tube

Length in.(mm) - ft.(mm)

24 - 10(609 - 3048)

24 - 10(609 - 3048)

24 - 10(609 - 3048)

24 - 10(609 - 3048)

Water Volume, gallons(liters)

112 (424) 112 (424) 107 (405.0) 107 (405.0)

Max. Water Pressure,psi (kPa)

175 (1207) 175 (1207) 175 (1207) 175 (1207)

Max. RefrigerantPressure, psi (kPa)

300 (2068) 300 (2068) 300 (2068) 300 (2068)



DATA 360B 370B 380B 425BCkt 1 Ckt 2 Ckt 3 Ckt 4 Ckt 1 Ckt 2 Ckt 3 Ckt 4 Ckt 1 Ckt 2 Ckt 3 Ckt 4 Ckt 1 Ckt 2 Ckt 3 Ckt 4

BASIC DATAUnit Capacity @ ARIConditions, tons (kW)

350.0 (1232) 360.0 (1267) 372.0 (1309) 401.0 (1412)

Unit Operating ChargeR-22, lbs (kg)

175(79.4)

175(79.4)

180(81.6)

180(81.6)

175(79.4)

180(81.6)

180(81.6)

180(81.6)

180(81.6)

180(81.6)

180(81.6)

180(81.6)

190(86.2)

190(86.2)

190(86.2)

190(86.2)

Cabinet Dimensions,L x W x H, in. (mm)

459 x 83.4 x 94.5(11659 x 2118 x 2400)

459 x 83.4 x 94.5(11659 x 2118 x 2400)

459 x 83.4 x 94.5(11659 x 2118 x 2400)

459 x 83.4 x 94.5(11659 x 2118 x 2400)

Unit OperatingWeight, lbs (kg)

22920(10395)

22970(10417)

23020(10440)

23813(10800)

Unit Shipping Weight,lbs (kg)

22000(9977)

22050(10000)

22100(10023)

22715(10302)

COMPRESSORS, SCREW, SEMI-HERMETICNominal Capacity,

tons (kW)80

(280)80

(280)95

(335)95

(335)80

(280)95

(335)95

(335)95

(335)95

(335)95

(335)95

(335)95

(335)95

(335)95

(335)95

(335)95

(335)CONDENSERS, HIGH EFFICIENCY FIN AND TUBE TYPE WITH INTEGRAL SUBCOOLER

Coil Face Area, ft.(m2)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

115.6(10.7)

Finned Height xFinned Length, ft.

(mm)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

80x208(2032x5283)

Fins Per Inch x RowsDeep

12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4 12 x 4

CONDENSER FANS, DIRECT DRIVE PROPELLER TYPEFan Qty. Dia., in.

(mm)24 – 28 (711) 24 – 28 (711) 24 – 28 (711) 24 – 28 (711)

No. of Motors, hp(kW)

24 - 2.0 (1.5) 24 - 2.0 (1.5) 24 - 2.0 (1.5) 24 - 2.5 (1.9)

Fan RPM, 60Hz 1140 1140 1140 1140Fan Tip Speed, fpm 8357 8357 8357 8357Unit Airflow, ft3/sec 238128 238128 238128 257180

EVAPORATOR, DIRECT EXPANSION, BAFFLED SHELL AND THROUGH TUBEShell Dia. -- Tube

Length in.(mm) - ft.(mm)

24 - 10(609 - 3048)

24 - 10(609 - 3048)

24 - 10(609 - 3048)

24 - 12(609 - 3658)

Water Volume, gallons(liters)

107 (405.0) 107 (405.0) 107 (405.0) 129 (488)

Max. Water Pressure,psi (kPa)

175 (1207) 175 (1207) 175 (1207) 175 (1207)

Max. RefrigerantPressure, psi (kPa)

300 (2068) 300 (2068) 300 (2068) 300 (2068)

annmariej


Dimensions, ALS

Figure 7, Dimensions, ALS 125B – ALS 204B


Figure 8, Dimensions, ALS 220B –280B


Figure 9, Dimensions, ALS 300B - 340B


Figure 10, Dimensions, ALS 360B - ALS 425B

annmariej


Installation and Application

RiggingCare should be taken to avoid dropping the unit during unloading or moving as this may resultin serious damage. Do not push or pull the unit from anything other than the base, and blockthe fork lift away from the unit to prevent damage to the sheet metal cabinet and end frame.Do not lift the unit with a fork lift truck. To lift the unit, two 2 1/2 inch (65mm) diameterlifting holes are provided in the base of the unit. Spreader bars must be used betweenrigging lines to prevent damage to the condenser coils or unit cabinet.

Unit PlacementFor roof mounted applications, the unit should be installed on a steel channel or I-beam frameto support the unit above the roof. For ground level applications, the unit should be installedon a substantial base that will not settle. A one piece concrete slab with footings extendedbelow the frost line is recommended. The foundation must be level within 1/2 inch (13mm)over its length and width and strong enough to support the unit's operating weight as listed inthe Physical Data tables.

On ground level applications fin protection against vandalism is recommended, either by theoptional factory installed condenser coil guard or a field installed screen fence. Note that thefence must allow free flow of air to the condenser coil for proper unit operation.

ClearancesSince these units are air cooled, the flow of air to and from the condenser coil must not beimpeded. Restricting unit airflow and air recirculation will result in a decrease in unitperformance and efficiency due to an increase in operating discharge pressures. Althoughthe MicroTech chiller control system will cycle fans or may unload compressors to maintainthe optimum system head, adequate clearances must be obtained. Warm air recirculationand condenser coil air starvation can be prevented with proper design.

There must be no obstruction above the unit that would tend to deflect discharge airdownward where it could be recirculated back to the inlet of the condenser coil. Thecondenser fans are propeller type and ductwork should not be applied to the fan outlet.Further information on air restriction can be found in Application Manual AM ALSWHS.

For lateral clearance considerations, the unit must be installed with sufficient clearance forair entrance to the coil and for servicing. Service access to the evaporator, compressors,electrical control panel and piping components must be provided as per the limitations inFigure 11 through Figure 13. Do not block access to sides or ends of unit with piping orconduit.

Debris should not be allowed to accumulate in the vicinity of the unit. Air movement maydraw debris into the condenser coil causing coil starvation. Special consideration should begiven to units installed in cold climates where snow accumulation is common. Condensercoils and fan discharge must be kept free of snow or other obstructions to permit adequateairflow for proper unit operation. Units mounted next to a building with a sloping roof mustbe protected from falling ice and snow.

Sound isolationThe ultra-low sound level for the ALS screw chiller satisfies most customer requirements.However, there may be applications where extremely low sound levels may be required.The most effective isolation method is to locate the unit away from sound sensitive areas.Avoid locations beneath windows or between structures where normal operating sounds maybe objectionable. Isolating water lines, electrical conduit and the unit itself can reducestructurally transmitted sound. Wall sleeves and rubber isolated piping hangers can be usedto reduce transmission of water or pump noise into occupied spaces, and flexible electricalconduit can be used to isolate sound through electrical conduit. Spring isolators are effectivein reducing the low amplitude sound generated by screw compressors and can be used forunit isolation in sound sensitive areas.


Figure 11, Clearance Requirements, ALS 125B – ALS 204B




Notes:

1. Minimum side clearance between two units is 12 feet (3.7 meters).

2. Unit must not be installed in a pit or enclosure that is deeper or taller than the height ofthe unit unless extra clearance is provided per note 4.

3. Minimum clearance on each side is 8 feet (2.4 meters) when installed in a pit no deeperthan the unit height.

4. Minimum side clearance to a side wall or building taller than the unit height is 8 feet (2.4meters) provided no solid wall above 6 feet (1.8 meters) is closer than 12 feet (3.7meters) to the opposite side of the unit.

5. The removable post for compressor service access must not be blocked at either side ofthe unit.

6. Do not mount electrical conduits, etc, above the side rail on either side of the unit.

7. There must be no obstruction of the fan discharge.

Typical Chilled Water PipingThe return water line must be piped to the evaporator inlet connection (the connectionclosest to the compressors) and the supply water line must be piped to the evaporator outletconnection.

A flow switch must be installed in the horizontal piping of the supply (evaporator outlet)water line.


Drain connections must be provided at all low points in the system to permit completedrainage of the system. Air vents must be located at the high points in the system to purgeair out of the system. A vent connection is located on top of the evaporator vessel under theinsulation to permit the purging of air out of the evaporator. Air must be purged from thewater system prior to unit start up to insure adequate flow through the vessel and to preventsafety cutouts on the freeze protection.

Pressure gauges must be installed in the inlet and outlet water lines to the evaporator.Pressure drop through the evaporator should be measured to determine proper flow fromFigure 3. Vibration eliminators are recommended in both the supply and return water linesand must be used if the unit is mounted on spring isolators. Isolation valves in the chilledwater supply and return are required.

Chilled water piping should be insulated to reduce heat loss and prevent condensation.Chillers not operating in the winter should have the water systems thoroughly drained toprotect against freezing. If the chiller operates year-round, or if the system is not drained forthe winter, the chilled water piping exposed to outdoor air should be protected againstfreezing by wrapping the lines with a heater cable. An adequate percentage of glycol shouldbe added to the system to further protect the system during low ambient periods.

Figure 14, Typical Chilled Water Piping

Series vs. Parallel OperationSystem pressure drop must be considered when laying out the water piping. Parallel pipedchiller systems have one half of the total system flow going through the evaporator of eachchiller, keeping the individual unit and total system pressure drop relatively low. Series pipedevaporators require that the total system fluid flow through both evaporators. Not only is thepressure drop through each evaporator dramatically increased but the pressure drops mustbe added together to obtain the total evaporator pressure drop. Series piped evaporatorsnormally require larger circulating pumps for the chilled water system.

Temperature and Water Flow LimitationsALS units are designed to operate in ambient conditions from 40°F to 120°F (4°C to 50°C)with a low ambient option allowing operation down to 0°F (-18°C) using the optionalSpeedTrol control. The minimum ambient temperature is based on still conditions where the


wind is not greater than five mph. Greater wind velocities will result in reduced headpressure, thus the minimum operating ambient temperature will increase. The ALS aircooled chillers are available with field installed wind baffles which allow the chiller to operateeffectively down to the ambient temperature for which it was designed.

The minimum and maximum evaporator flow rates are shown in Figure 3. Flow rates belowthe minimum values may result in laminar flow causing poor heat transfer, scaling and poorcontrol. Flow rates above the maximum values will result in unacceptable pressure dropsand may cause excessive nozzle and tube erosion, potentially leading to failure.

Evaporator Freeze ProtectionEvaporator freeze protection can be a concern in the application of air-cooled water chillerswith onboard evaporators. To protect against freeze-up, insulation and an electric heatercable are provided as standard, protecting the evaporator down to -20°F (-29°C) ambient airtemperature. Although the evaporator is equipped standard with freeze protection, it doesnot protect water piping external to the unit or protect the evaporator in the event of a powerfailure or heater cable burnout. The following recommendations may be considered foradditional protection:

1. Drain the evaporator and chilled water piping if the unit will not be operated during thewinter. Drain and vent connections are provided on the evaporator to facilitate draining.

2. Add a glycol solution to the chilled water system to provide antifreeze protection.Freeze point should be approximately ten degrees below minimum design ambienttemperature. Excessive glycol concentrations should be avoided, 50 percent maximumfor ethylene glycol and 35 percent maximum for propylene glycol is recommended.

The evaporator heater cable is wired to the 115 volt circuit in the control box. It isrecommended that this power be supplied from a separate source, but it may be suppliedfrom the control circuit. Operation of the heater cable is automatic through the ambientsensing thermostat that energizes the evaporator heater cable for protection against freeze-up. Unless the evaporator is drained in the winter, the disconnect switch to the evaporatorheater must not be open.

Alternately, the evaporator on all ALS units can be remotely mounted indoors. This removesthe chilled water from a freezing environment and eliminates the potential for freezing. Seethe following Remote Evaporator section for details.

Electrical Connections

All wiring must be done in accordance with applicable local and national codes.

ALS units may be ordered with internal power wiring for either single or multiple pointpower connections. If single point power connection is ordered, a single power terminalblock is provided and wiring within the unit is sized in accordance with the U.S.A. NationalElectrical Code. A single field supplied disconnect is required. If multiple point power wiringis ordered, two power connections are required for ALS 125B - ALS 204B and ALS 300B -ALS 425B. Three power connections are required for ALS 220B - ALS 280B. Wiringwithin the unit is sized in accordance with the U.S.A. National Electrical Code. Separatefield supplied disconnects are required for each circuit.


Disconnecting means are addressed by Article 440 of the U.S.A. National Electrical Code(NEC) which requires "disconnecting means capable of disconnecting air conditioning andrefrigerating equipment including motor-compressors, and controllers from the circuitfeeder." The disconnect switch should be selected and located within the NEC guidelines.Maximum recommended fuse sizes are given in the electrical data tables of this catalog forhelp in sizing the disconnect.

ALS units have single or multiple factory installed main power supply connection pointswhich require one, two, or three main power supply disconnect switches, supplied by others.For recommended copper power lead wire sizes, refer to the Electrical Data Tables.

Terminals are provided in the unit control center for field hookup of the control circuit to a115 volt power supply. An optional control circuit transformer is available, factory installed,to eliminate the requirement for a separate power supply to the control circuit.

Terminals are provided in the unit control center for field hookup of the evaporator heater toeither a separate 115 volt power supply or to control circuit power.

Remote Evaporator

GeneralThe multiple compressor ALS air-cooled chillers are available with remote evaporator. Thisallows the main unit to be installed outdoors to save interior room and eliminates the need foranti-freeze solutions and heat tracing of chilled water lines since the chilled water system isindoors. There are some general guidelines to review before proceeding:

1. R-22 only.

2. Maximum line length of 50 ft (15 m) and Total Equivalent Length (TEL) of 120 ft(37 m).

3. Evaporator not more than 6 ft (1.8 m) above the compressor or 16 ft (5 m) belowcompressor.

4. No underground piping.

5. No hot gas bypass.

6. Units with remote evaporator are not included in the ARI Certification Program.

The remote evaporator is shipped separately, ready for quick and easy installation at the jobsite. All refrigerant accessories such as liquid-vapor line shut-off valves, replaceable corefilter-driers, liquid line solenoid valves, electronic expansion valves, and sightglasses arealready included on the ALS condensing unit. The evaporator is equipped with entering andleaving chilled water temperature sensor wells. The sensors are pre-wired to the ALS unitwith 75 feet long sensor leads that must be field connected to the evaporator thermowells.Suction pressure transducers and temperature sensors must also be relocated to theevaporator. ALS units are shipped with a holding charge of refrigerant. Field piping must beleak tested, evacuated and the entire unit charged during installation. Do not exceed 150psig test pressure unless the unit is blanked off from the piping.


Performance Derate FactorsAll performance tables and adjustment factors found in this catalog are applicable for remoteevaporator installations, however, a performance derate must be applied to the R-22performance data due to additional pressure drops in the suction and liquid lines which causea loss of compressor performance. These derates are based on a suction line pressure dropequivalent of approximately 2°F (1°C) change in saturation temperature.

For R-22 applications:

Capacity = Tons(kW) x 0.97

Power = Compressor kW x 0.99

Suction Lines

General

Careful design of the refrigerant piping is necessary for efficient system operation. Therefrigerant piping should be designed for a low pressure drop to obtain maximum capacityand efficiency while maintaining adequate velocity. Lines should slope in the direction offlow to assure good oil return to the compressors. Cost considerations favor keeping linesizes as small as possible while not exceeding acceptable pressure drops in order to maintainunit performance.

NOTE

All refrigerant piping must be reviewed by McQuay Application Engineersprior to order entry and will be verified by McQuay startup technicians.

Suction line sizing

Pressure drop in the suction line reduces system capacity and efficiency because it forcesthe compressor to operate at lower suction pressure. The suction line should be sized for apressure drop approximately equivalent of 2°F (1°C) change in saturation temperature. Forsuction line sizing see Table 33 through Table 35. For applications with the evaporator belowthe ALS unit, the vertical section of the suction lines must be sized to return oil to thecompressors at the minimum compressor capacity step.

Example of Suction Line Size Calculation

ALS140B condensing unit with refrigerant R-22

Evaporator located 5 feet below the ALS compressor.

Lineal length of horizontal suction line is 25 feet

Suction line requires 7 long radius (90°) elbows; 3 in the horizontal, 4 in the riser

From Table 33, the nominal circuit capacities for circuit 1 and 2 are 65 and 80 tonsrespectively

Total lineal suction line length = 30 feet each circuit (25 feet horizontal plus 5 feetvertical riser). For the first try, assume that the total equivalent suction line length istwice the lineal suction line length.

Therefore the estimated total equivalent suction line length = 60 feet


From Table 34 and Table 35, For nominal circuit capacities of 65 & 80 tons and equivalentline length of 60 ft, the suction line size = 2 5/8" for horizontal lines and 2 1/8" for verticallines.

From Table 38, Fitting loss for 2 5/8" long radius (90°) elbow = 4.1 ft, and 3.3 ft for the 2 1/8elbows.

Therefore fitting loss in equivalent feet of pipe for (3) 2 5/8" long radius (90°) elbow =12.3 ft, and 13.2ft for (4) 2 1/8" elbows.

Therefore the actual equivalent suction line length = 30 + 12.3 + 13.2 = 55.5 feet

From Table 34 and Table 35, For nominal circuit capacities of 65 & 80 tons and equivalentline length of 55.5 ft the suction line size is correct.

Table 33, ALS 125B-280B Nominal Circuit CapacitiesALS Model Circuit 1 Circuit 2 Circuit 3 Circuit 4

Tons (kW) Tons (kW) Tons (kW) Tons (kW)125B 65 (229) 65 (229) - -140B 65 (229) 80 (262) - -155B 80 (262) 80 (262) - -170B 80 (262) 95 (334) - -175B 80 (262) 95 (334) - -185B 95 (334) 95 (334) - -195B 95 (334) 95 (334) - -204B 95 (334) 95 (334) - -220B 65 (229) 80 (262) 80 (262) -235B 80 (262) 80 (262) 80 (262) -250B 80 (262) 80 (262) 95 (334) -265B 80 (262) 95 (334) 95 (334) -280B 95 (334) 95 (334) 95 (334) -300B 65 (229) 65 (229) 80 (262) 80 (262)315B 65 (229) 80 (262) 80 (262) 80 (262)330B 80 (262) 80 (262) 80 (262) 80 (262)340B 80 (262) 80 (262) 80 (262) 95 (334)360B 80 (262) 80 (262) 95 (334) 95 (334)370B 80 (262) 95 (334) 95 (334) 95 (334)380B 95 (334) 95 (334) 95 (334) 95 (334)425B 95 (334) 95 (334) 95 (334) 95 (334)

Table 34, Vertical Upflow Suction Line SizesVertical Upflow Suction LinesNominal Circuit

CapacityTons (kW)

Equivalent Line Length Ft (m) Suction Line Size (in.)

40 (12) 2 1/865 (229)

75 (23) 2 1/840 (12) 2 1/8

80 (262)75 (23) 2 1/840 (12) 2 5/8

95 (334)75 (23) 2 5/8

Table 35, Horizontal and Vertical Downflow Suction Line SizesVertical Downflow and Horizontal Suction LinesNominal Circuit

CapacityTons (kW)

Equivalent Line Length Ft (m) Suction Line Size, in.

40 (12) 2 5/865 (229) 75 (23) 2 5/8

115 (35) 2 5/8


40 (12) 2 5/880 (262) 75 (23) 2 5/8

115 (35) 3 1/840 (12) 2 5/8

95 (334) 75 (23) 3 1/8115 (35) 3 1/8

Liquid-Vapor LinesThe liquid-vapor line from the ALS condensing unit to the evaporator liquid connection is nota conventional liquid line since it carries both liquid and vapor. The compressors on the ALSunits utilize a liquid cooled motor and an economizer. Therefore the expansion valve whichfeeds the full flow of liquid refrigerant into the compressor for motor cooling is mounted inthe liquid line between the condenser sub-cooling coil and the compressor inlet; not at theevaporator inlet. The liquid-vapor line to the evaporator is a low pressure line downstreamof the expansion valve and the size is slightly larger than a normal liquid line. For liquid linesizing see Table 36 and Table 37.

Table 36, Vertical Upflow Liquid-Vapor Line SizesVertical Upflow Liquid-Vapor LinesNominal Circuit

CapacityTons (kW)

Equivalent Line LengthFt (m)

Liquid-Vapor Line Size o.d(in.)

40 (12) 1 3/865 (229)

75 (23) 1 3/840 (12) 1 3/8

80 (262)75 (23) 1 3/840 (12) 1 5/8

95 (334)75 (23) 1 5/8

Table 37, Horizontal and Vertical Downflow Liquid-Vapor Line SizesVertical Downflow and Horizontal Liquid-Vapor LinesNominal Circuit

CapacityTons (kW)

Equivalent Line LengthFt (m)

Liquid-Vapor Line Size o.d(in.)

40 (12) 1 3/865 (229) 75 (23) 1 3/8

115 (35) 1 3/840 (12) 1 3/8

80 (262) 75 (23) 1 5/8115 (35) 1 5/840 (12) 1 5/8

95 (334) 75 (23) 1 5/8115 (35) 1 5/8

InsulationAll piping joints and fittings must be thoroughly leak tested before insulation is applied.Suction lines must be insulated and should not be installed underground. Suction lineinsulation must be selected to prevent condensation under local ambient conditions with thelines at 40°F to 50°F (4.4°C to 10°C) operating temperatures. The liquid-vapor lines willoperate at 40°F to 60°F (4.4°C to 15.6°C) and must also be insulated to prevent sweatingand heat gain.


Location and ArrangementRefrigerant lines should be as short and direct as possible to minimize tubing and fittings.Long radius elbows must be used (except for traps) to minimize the pressure drops. Trapsshould be as short as possible to minimize oil accumulation. Refrigerant piping should bearranged so that normal inspection of the equipment is not hindered. Adequate clearanceshould be provided between refrigerant piping and adjacent walls for insulation. Pipingshould be run so that it does not interfere with compressor service access, passages orobstruct headroom, windows and doors. Suction line hangers must be sized and located tosupport the weight of the piping in accordance with good piping practice.

Suction and liquid-vapor connection points for each circuit are labeled to facilitate fieldpiping. Care must be exercised in routing the piping to avoid mixing piping from differentcircuits. The circuits on the outdoor ALS unit must match the circuits on the evaporator (i.e.circuit #1 on the outdoor ALS unit must be connected with circuit #1 on the evaporator).

Horizontal portions of the suction lines must be downward sloping toward the compressors.Slope all piping in the direction of flow. Vertical portions of the suction lines must be sizedfor oil return at minimum compressor load.

Note: Double section risers must not be utilized on any circuit. Traps must be provided asshown on Figure 15 and Figure 16.

Equivalent Line LengthsRecommended refrigerant line sizes are based on equivalent line lengths of straight pipe, thatis, a combination of straight pipe, fittings and valves. The pressure drop through valves andfittings is determined by establishing the equivalent straight length of pipe of the same sizewith the same friction loss. The "Total Equivalent Length" is the sum of the "Lineal LineLength" and the appropriate "Valve and Fitting Losses in Equivalent Feet of Pipe for FieldSupplied Piping" given in Table 38.

Table 38, Fitting Equivalent Feet of PipeLine Size (in.) Angle Valve Globe Valve 90° Std. Radius Elbow 90° Long Radius Elbow

1 1/8 12 29 2.6 1.71 3/8 15 38 3.3 2.31 5/8 18 43 4.0 2.62 1/8 24 55 5.0 3.32 5/8 29 69 6.0 4.13 1/8 35 84 7.5 5.0

Figure 15, Evaporator Above ALS Unit


Figure 16, Evaporator Below ALS Unit

NOTE: Keep the trap width at a minimum to avoid trapping excessive oil.

Startup ProceduresNOTE: McQuayService or an authorized McQuay service agent must do initial start-up andcommissioning.

Filter DriersFollowing an initial 24 hour operation the pressure drop across the replaceable core, filterdrier should be checked. If this pressure drop exceeds the values given in Table 39 at thevarious load conditions the filter drier cores must be replaced. Also if the moisture indicatingsight glass shows a wet system condition after 24 hours of operation the filter cores must bechanged. This should remove any contaminants introduced during field piping. The filterdrier cores must also be changed anytime the system is opened for servicing.

Table 39, Filter Drier Pressure DropPercent CircuitLoading (%)

Maximum Recommended Pressure Drop Across Filter Drierpsig (kPa)

100 10 (69.0)75 8 (55.2)50 5 (34.5)25 4 (27.6)

Refrigerant and Oil ChargeThe relative position of the ALS unit and the evaporator and the distance between themplays a critical role in determining suction and liquid line sizes and the field refrigerant and oilcharges. ALS units with the remote evaporator option are shipped with a factory refrigerantand oil charge suitable for the normal packaged unit. It will be necessary to add refrigerantand oil for the added connecting piping to the remote evaporator. See Table 40 forrefrigerant charge for suction and liquid-vapor lines. McQuayService will supply and add theadditional oil required by the refrigerant piping. The correct oil is Planetelf ACD68AW,McQuay Part No. 735030439 (5 gal.), 735030438 (1 gal.).

Charging Procedure

The calculated refrigerant and oil charge must be added through the factory suppliedcharging valve located on the liquid-vapor line coming out of the compressor. Sufficientcharge must be added to clear the liquid line sight glass located at the outlet of thecondenser. Add an extra 10 lb. of refrigerant after the sight glass is clear. Note : Chargemust never be added through the compressor suction line.


Table 40, Refrigerant Charge for Suction and Liquid-Vapor LinesSuction Line Refrigerant

Charge lb (kg)

Liquid-Vapor Line RefrigerantChargelb (kg)

Lineal TubingLengthFt (m)

Line (in.) R-22 Line (in.) R-22

2 1/8 0.33 (0.15) 1 3/8 3.6 (1.6)10 (3) 2 5/8 0.51 (0.23) 1 5/8 5.0 (2.3)

3 1/8 0.71 (0.32)2 1/8 0.66 (0.30) 1 3/8 7.2 (3.3)

20 (6) 2 5/8 1.02 (0.46) 1 5/8 10.0 (4.5)3 1/8 1.42 (0.64)2 1/8 0.99 (0.45) 1 3/8 10.8 (4.9)

30 (9) 2 5/8 1.53 (0.69) 1 5/8 15.0 (6.8)3 1/8 2.13 (0.96)2 1/8 1.32 (0.60) 1 3/8 14.4 (6.5)

40 (12) 2 5/8 2.04 (0.92) 1 5/8 20.0 (9.0)3 1/8 2.84 (1.29)

Oil Charge Calculation

Total Field Oil Charge = 4% by weight of the field refrigerant charge added to the suctionand liquid-vapor lines.

Note: For every 10 lb. (160 oz) of refrigerant charge added, a 6.4 oz (equal to 0.4 pint fluidmeasure) oil charge is required.

Example: (In I-P Units)

Total suction line lineal length = 20 ft.; Suction line size = 2 5/8 in.

Total liquid-vapor line lineal length = 30 ft.; Liquid-Vapor line size = 1 5/8

From Table 40 obtain the suction and liquid-vapor line refrigerant charge

Refrigerant charge required in the suction line = 1.0 lb.

Refrigerant charge required in the liquid-vapor line = 15.0 lb.

Total Refrigerant charge required in the suction and liquid-vapor line = 16.0 lb.

Total Oil Charge = 4% by weight of the total field refrigerant charge added to the suctionand liquid-vapor lines = 10.3 oz (0.6 pint)

Notes:

1. The only approved oil is that identified on the label attached to the compressors. AllPOE oils are hygroscopic and care should be exercised in handling the oil to avoidabsorption and retention of moisture.

2. Do not leave the oil container open for more than a minute while charging oil. Do notuse oil that has not been properly sealed and stored.

3. The evaporator is supplied without heater.

DimensionsUse the ALS dimension drawings Figure 7 to Figure 10 for the ALS with remote evaporator.The refrigerant connections are located approximately where the refrigerant connections to


the unit mounted evaporator are on a packaged chiller. The remote evaporator dimensionsare Figure 17 through Figure 19.


Dimensions, Remote Evaporator

Figure 17, Evaporator for ALS 125 - ALS 185

ALS Evaporator Water Volume Refrig Volume Weights lb. (kg) R-22 Operating Charge lb. (kg)Model Model gal. (l) lb. (kg) Operating Shipping Circuit 1 Circuit 2

125 1207-C 30 (113) 170 (77) 1534 (697) 1342 (608) 4.04 (1.8) 4.04 (1.8)140-185 1407-A 31 (119) 222 (100) 1743 (792) 1536 (696) 5.27 (2.4) 5.27 (2.4)

ALS Evap. Overall Dimensions in. (mm)Model Model Length "A" Height "C" "D" "E" "F" "G" "H"

125 1207C 89.3 (2268) 22.6 (574) 5.8 (147) 82.5 (2096) 8.5 (216) 4.50 (114) 87.00 (2210)140-185 1407A 94.0 (2388) 22.6 (574) 5.8 (147) 82.5 (2096) 10.5 (267) 6.50 (165) 89.00 (2261)



ALS Evaporator Water Volume Refrig Volume Weights lb. (kg) R-22 Operating Charge lb. (kg)Model Model gal. (l) lb. (kg) Operating Shipping Circuit 1 Circuit 2

195 1608-2 55 (208) 175 (79) 1404 (638) 959 (436) 26 (12) 26 (12)204 2008-2 98 (373) 210 (95) 1956 (889) 1137 (517) 32 (14) 32 (14)

ALS Evaporator Dimensional DataModel Model A C D H J K

195 1608-2 21.3 (542) 12.1 (307) 16.0 (406) 6.9 (176) 84.5 (2149) 96.7 (2459)204 2008-2 23.6 (601) 12.4 (315) 20.0 (508) 9.2 (235) 86.6 (2202) 99.7 (2533)



ALS Evaporator Water Volume Refrig Volume Weights lb. (kg) R-22 Operating Charge lb. (kg)Model Model gal. (l) lb. (kg) Operating Shipping Circuit 1 Circuit 2 Circuit 3

220-235 2008-2 98 (371) 215 (97) 1961 (888) 1146 (519) 22 (10) 22 (10) 22 (10)250-280 2008-3 94 (357) 243 (110) 1984 (899) 1190 (539) 24 (11) 24 (11) 24 (11)


Figure 20, ALS 300 - ALS 425

ALS Evaporator Water Vol. Refrig Vol. Weights lb. (kg) R-22 Operating Charge lb. (kg)Model Model gal. (l) lb. (kg) Operating Shipping Circuit 1 Circuit 2 Circuit 3 Circuit 4

300-380 2208-1 115 (435) 306 (139) 2424 (1102) 1439 (654) 23 (10) 23 (10) 23 (10) 23 (10)425 2208-2 110 (416) 345 (156) 2457 (1117) 1500 (682) 26 (12) 26 (12) 26 (12) 26 (12)


Standard Features

Full Factory TestingFactory run tests with water hookups on all units prior to shipment help insure a trouble freestart-up. Each unit is pressure tested, evacuated, and charged with a full operating charge ofrefrigerant and oil. Extensive quality control checks and individual unit tests insure that allcontrols are properly adjusted and operating correctly. Job site start-up and expenses arekept to a minimum as the unit is shipped ready to operate.

RiggingDesigned for easy handling and low installation costs, the ALS air-cooled screw chillers areassembled on a rugged galvanized steel channel base. The channel base distributes the unitweight for uniform low roof loading. Lifting holes are provided in the base of the unit tosimplify installation.

Cabinet ConstructionThe unit casing and all structural members and rails are fabricated of continuous G90galvanized steel and galvanized steel channel. The galvanized coating is applied to the basemetal by the hot dip process and conforms to standard ASTM A525. The exterior casing isphosphatized and painted with a beige urethane finish.

CompressorsAll units feature multiple compressors with independent refrigerant circuits. The compressoris a direct drive, 3600 rpm, single-screw type with one main screw rotor that meshes withtwo diametrically opposed gaterotors. The two exactly opposed gaterotors create twoexactly opposed compression cycles resulting in a well balanced compression cycle.

The compressor utilizes an internal economizer to enhance the unit's refrigeration effect andto allow the compressor to run at a more efficient operating point. During the economizercycle vapor produced at the electronic expansion valve and motor cooling process isredirected to the rotor inlet, while the remaining liquid refrigerant flows to the evaporator.

Unlike twin-screw designs, the ALS single-screw compressor uses liquid refrigerant insteadof oil to seal the rotors. The oil management concerns associated with oil injection systemsare a thing of the past.

The electric motor is semi-hermetic, squirrel cage induction type and cooled by liquidrefrigerant. This allows the motor to operate at lower temperatures enhancing systemreliability and motor life when compared to suction gas cooled motors found on reciprocatingand twin-screw compressors.

Each compressor is equipped with suction and discharge shutoff valves to facilitate servicework.

EvaporatorThe evaporator is a direct expansion, shell-and-tube type with water flowing in the baffledshell and refrigerant flowing through the tubes. Independent refrigerant circuits within theevaporator serve each compressor.


The evaporator is constructed with a carbon steel shell and seamless high efficiency coppertubes. Roll expansion anchors the refrigerant tubes in the heavy carbon steel tube sheets.

Refrigerant heads are constructed of carbon steel and are removable to permit access to thetubes from either end. For easy draining and venting of the shell, 3/8 inch vent and drainplugs are provided on the top and bottom of the shell.

The evaporator is wrapped with an electric resistance heater cable (except remoteevaporators) and insulated with ¾ inch thick vinyl nitrate polymer sheet insulation to providefreeze protection down to 20°F (-29°C) ambient air temperature. An ambient thermostatcontrols the heater cable. (Note : A water flow switch must be field installed to protectagainst evaporator freeze-up under low water flow conditions.)

The evaporator insulation has a K factor of 0.28 at 75°F (24°C). The insulation is fitted andcemented in place, then painted with a resilient vinyl base paint to resist cracking.

The tube side maximum working pressure is 300 psi (2068 kPa). The water side workingpressure is 175 psi (1207 kPa). All evaporators are designed, constructed, inspected andstamped in accordance with the requirements of the ASME Boiler and Pressure VesselCode.

Condenser Fans and MotorsMultiple direct-drive propeller fans operate in formed bell shaped orifices at low tip speedsfor maximum static efficiency and minimum noise and vibration. Each fan is protected by aheavy-gauge close meshed fan guard and is positioned within the unit cabinet for maximumprotection against the elements.

A heavy-duty, 3-phase motor with permanently lubricated ball bearings and inherent overloadprotection drives each condenser fan. Factory fusing provides positive protection from shortcircuiting.

Condenser CoilsThe condenser coils are constructed with internally enhanced seamless copper tubesarranged in a staggered row pattern and mechanically expanded into McQuay lanced andrippled aluminum fins with full fin collars. The fins have full drawn collars to completelycover the copper tube for protection against atmospheric corrosion and provide excellentheat transfer. An integral subcooler with a liquid sightglass on the inlet provides sufficientsubcooling to effectively eliminate the possibility of liquid flashing and increase unitefficiency.

Control CenterThe ALS screw chiller is shipped with all operating and safety controls and motor startingequipment factory wired, operationally tested, and ready for service. All controls arecentrally located in a NEMA type 3R weatherproof, hinged control center, with key lockeddoors to prevent unauthorized entry. Panel access doors include steel rod door retainers toprevent flapping while open. Dead front panels protect service personnel from accidentalcontact with line voltage components.


Optional Features

Control circuit transformerFor applications where a separate 115 volt power source is not available, the transformer isfactory installed and wired between the line voltage power terminal block and the 115 voltcontrol circuit.

Delta-delta reduced inrush startDelta-delta start works on the same principle as part winding start. It works in conjunctionwith the unit's standard compressor sequence start timers to reduce current inrush byproviding 2-step starting of each compressor.

Low ambient head pressure controlOptional SpeedTrol head pressure control permits unit operation down to 0°F (-18°C)ambient. However, since the actual minimum ambient can be dependent on wind conditions,wind baffles are also available.

Disconnect switchA factory installed nonfused disconnect switch is available on all units. The disconnectswitch is properly sized for model and voltage required.

Phone modemAn optional 9600 baud modem interface is available which allows the operator to control (ormonitor) all chiller operations from a remote location through standard phone lines.

Ice storageThe unit can be equipped with control logic to handle the low temperatures associated withthermal storage applications. In addition to the change within the controller, the unit issupplied with additional evaporator insulation to prevent any loss of efficiency throughcondensation.

Copper fin condenser coilsCopper fin condenser coils are available as an option on all models.

Baked epoxy condenser fin coatingElectro Fin flexible dip and bake epoxy protective coating with 3000+ hour salt sprayresistance (ASTM B117-90) is available on the condenser coils and coil frames. Providesprotection against adverse environments such as salt air as found on sea coast applicationsand many chemical environments. Consult factory for complete specification and chemicalresistance chart.

Protective coil or base guardsOptional factory installed wire mesh coil guards and base guards provide protection forground level installations.


Wind bafflesThe presence of wind will have an adverse affect on any air-cooled chiller. Wind across acondenser coil will not allow a chiller to operate as efficiently, or possibly not even start, atlow ambient temperatures. Wind in effect raises the minimum ambient temperature in whichthe chiller can operate. The ALS air-cooled chillers are available with field installed windbaffles which allow the chiller to operate effectively down to the ambient temperature forwhich it was designed.

Hail guardsHail can have a damaging effect on the performance of an air-cooled condenser. As thefinned area is flattened against the coil, restricting airflow, the efficiency of the coil isreduced. Hail guards are available for field installation to completely cover the coil finnedarea. The hail guards will also protect the coil from wind.

Totally enclosed fan cooled condenser fan motorsTEFC condenser fan motors are available as an option in lieu of the standard open drip-proof(ODP) fan motors when required by the application. When low ambient SpeedTrol isordered the number 1 condenser fan motor on each refrigerant circuit will still be open drip-proof.

Unit amps sensor packageA unit amp sensor package can be provided which will display the percent of total unit ampdraw at any given time.

115 volt convenience outletA 10.0 amp 115 volt convenience outlet mounted inside the control panel is available as anoption on all units.

Ground fault protectionA ground fault interrupter can be provided to shut down the entire unit if a ground faultcondition is sensed.

Water flow switchA water flow switch is available for field installation in the chilled water piping to preventevaporator freeze up under low or no flow conditions. Terminals are provided in the unitcontrol center for field hook up of the water flow safety switch.

Vibration isolatorsSpring vibration isolators are available for field installation under the unit base frame onsound sensitive applications.


Specifications

The specification is available in MSWord from the local McQuay sales office.SECTION 15XXX

AIR-COOLED ROTARY SCREW CHILLERSPART 1 - GENERAL

1.01 SUMMARY

Section includes design, performance criteria, refrigerants, controls, and installation

requirements for air-cooled rotary screw packaged chillers

1.02 REFERENCES

Comply with applicable Standards/Codes of ARI 590, ANSI/ASHRAE 15, and

ASME Section VIII.

1.03 SUBMITTALS

A. Submit shop drawings and product data in accordance with specification

requirements

B. Submittals shall include the following:

1. Dimensioned plan and elevation view drawings, required clearances,

and location of all field connections.

2. Summary of all auxiliary utility requirements such as electricity,

water, compressed air, etc. Summary shall indicate quality and

quantity of each required utility.

3. Single line schematic drawing of the power field hookup

requirements, indicating all items that are furnished.

4. Schematic diagram of control system indicating points for field

connection. Diagram shall fully delineate field and factory wiring.

5. Certification of factory run test of chiller unit signed by company

officer.

6. Installation manuals

1.04 QUALITY ASSURANCE

A. Qualifications; Equipment manufacturer must specialize in the manufacture

of the products specified and have five years experience with the equipment

and refrigerant offered.

B. Regulatory Requirements: Comply with the codes and standards specified


C. Chiller manufacturer must be ISO 9002 registered.

1.05 DELIVERY AND HANDLING

A. Chillers shall be delivered to the job site completely assembled and charged

with refrigerant and oil by the manufacturer

B. Comply with the manufacturers instructions for rigging and handling

equipment.

1.06 WARRANTY

The refrigeration equipment manufacturer’s warranty shall be for a period of one

year from date of equipment start up but not more than 18 months from shipment. It

shall cover defects in material and workmanship have proven defective within the

above period, including refrigerant lost due to a warranty failure.

PART 2--PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. McQuay International

B. (Approved Equal)

2.02 UNIT DESCRIPTION

Provide and install as shown on the plans factory assembled, factory charged, and

factory run tested air-cooled rotary screw compressor packaged chillers in the

quantity specified. Each chiller shall consist of multiple semi-hermetic rotary screw

compressors, direct expansion evaporator, air-cooled condenser section, control

system and all components necessary for safe and controlled unit operation.

2.03 DESIGN REQUIREMENTS

A. General: Provide a complete rotary screw packaged chiller as specified

herein and as shown on the drawings . The unit shall be in accordance with

the standards referenced in section 1.02 and any local codes in effect.

B. Performance: Refer to the schedule of performance on the drawings. The

chiller shall be capable of stable operation to a minimum of 25 percent of full

load without hot gas bypass. The unit shall be capable of operating to 40°F

(4.4°C) or 0°F (-18°F) if the low ambient option is specified. Performance

shall be in accordance with ARI Standard 550/590-98.


C. Acoustics: Sound pressure levels for the units shall meet or be lower than

_____dBA on the overall “A” weighted sound pressure level.

Measurements to be taken at full load at a distance of 30 feet (10 meters)

from the side of the unit.

2.04 CHILLER COMPONENTS

A. Compressors: The compressors shall be field serviceable, semi-hermetic,

single-screw type with one main helical rotor meshing with two opposed

gaterotors. If a twin-screw compressor is used, the manufacturer shall

provide an extended 5-year parts and labor warranty covering all moving

parts, due to the large bearing loads inherent with this design. The

gaterotors’ contact elements shall be constructed of a carbon impregnated

composite material designed for extended life. Liquid refrigerant shall be

used for cooling and sealing the rotor interfaces. Oil injection is not

permitted.

Electric motors shall be two pole, semi-hermetic, squirrel cage induction type

and cooled by circulating liquid refrigerant. Suction gas cooled designs shall

include an extended 5-year compressor warranty including parts and labor.

Full load power factor shall be a minimum of 0.90.

The compressor shall be provided with an internal economizer cycle to

improve system efficiency by subcooling the refrigerant flowing to the

evaporator. Units without an internal compressor economizer shall be

equipped with an external economizer of the flash type to provide an

equivalent degree of subcooling.

B. Evaporator: The evaporator shall be direct expansion type with carbon steel

shell, polypropylene water baffles, and high efficiency internally finned

copper tubes rolled into steel tubesheets. Refrigerant heads shall be

removable. The evaporator shall be insulated with 3/4 inch (19mm) closed

cell polyurethane insulation and heated with an electric heater to provide

freeze protection to -20°F (-29°C) ambient temperature. The evaporator

shall be designed, inspected, and stamped in accordance with ASME

Section VIII requirements.


C. Condenser: The condenser coils shall have seamless copper tubes

mechanically bonded into plate type fins. The fins shall have full drawn

collars to completely cover the tubes. A subcooling coil shall be an integral

part of the main condenser coil. Condenser fans shall be propeller type

arranged for vertical air discharge and individually driven by direct drive fan

motors. Each fan shall be in its own compartment to eliminate cross flow of

condenser air during fan cycling and shall be equipped with a heavy-gauge

fan guard. Fan motors shall be weather protected, single-phase, direct-

drive, 1140 rpm, open drip-proof type.

D. Refrigerant Circuit: The unit must have refrigerant circuits completely

independent of each other with one compressor per circuit. Each circuit

shall include an electronic expansion valve, compressor suction and

discharge shutoff valves, a liquid line shutoff valve, replaceable core filter-

drier, sight glass with moisture indicator, liquid line solenoid valve (no

exceptions), and insulated suction line.

E. Unit casing and all structural members and rails shall be fabricated of

continuous G90 galvanized steel. The galvanized coating shall be applied to

the base metal by the hot dip process and shall conform to ASTM A525.

The control enclosure and unit panels shall be cleaned and phosphatized,

then painted with a beige urethane finish. Unit base, structural members,

and fan panel tops shall be painted.

F. Microprocessor based control system: A NEMA Type 3R weatherproof

control panel shall contain the field power connection points, control

interlock terminals, and control system. Power and starting components

shall include factory fusing of fan motors and control circuit; individual

contactors for each fan motor, solid-state start timer, solid-state compressor

three-phase motor overload protection, inherent fan motor overload

protection and unit power terminal blocks for connection to remote

disconnect switch. Terminals shall also be provided for power supply to the

evaporator heater circuit. Hinged access doors shall be lockable. Barrier

panels are required to protect against accidental contact with line voltage

when accessing the control system.

The system shall stage the unit based on the leaving water temperature.

Safeties controlled by the microprocessor include motor protection, high


discharge pressure, loss of refrigerant, loss of water flow, freeze protection,

and low refrigerant pressure. Controls shall include auto/stop switch, chilled

water setpoint adjustment, anti-recycle timer, and digital display with water

temperature and setpoint, operating temperatures and pressures, and

diagnostic messages. The following features and functions shall be included:

1. The LCD type display shall have a minimum of 32 characters with

all messages in English. Units of measure will be I-P. Coded

messages and LED displays are not acceptable.

2. Critical parameters shall have their own section of control and be

password protected.

3. Resetting chilled water temperature by either controlling the return

water temperature or by a remote 4-20mA DC signal.

4. A soft load function to prevent the system from operating at full

load during the chilled fluid pulldown period.

5. An electronic time clock to allow programming of a yearly start-stop

schedule accommodating weekends and holidays.

6. Auto restart after a power failure without an external battery back-

up or auxiliary power for maintaining program memory.

7. Safety shutdowns shall be date and time stamped with system

temperatures and pressures recorded. A minimum of six previous

occurrences shall be kept in a revolving memory.

8. Start-to-start and stop-to-start timers to provide minimum

compressor off-time with maximum motor protection.

9. Capability of communication with a PC or remote monitoring

through a twisted pair RS-232 interface.

10. Lead-lag by manual selection or automatically by circuit run hours.

11. Discharge pressure control through intelligent cycling of condenser

fans.

12. Pro-active compressor unloading in response to high discharge

pressure or low evaporator pressure.

13. Continuous diagnostic checks of unit operation to provide a pre-

alarm signal in advance of a shutdown allowing time for remedial

action to be taken.


2.05 OPTIONS AND ACCESSORIES

The following options are to be included:

• Control circuit transformer, factory mounted

• Delta-delta reduced inrush starters, factory mounted

• Nonfused service disconnect switch, factory mounted

• Ground fault protection, factory installed

• Hot gas bypass, factory mounted

• Low ambient head pressure control to 0°F (18°C), factory mounted

• Copper fin condenser coils

• Baked epoxy condenser coating

• Totally enclosed air-over condenser fan motors

• Chilled water flow switch to be field mounted by contractor in the chilled water

line and field wired to terminals in the control panel.

• Spring vibration isolators for field installation

• Protective welded wire coil guards factory installed

• Protective welded wire lower base guards on compressor section

• 115 volt convenience outlet mounted in control panel

• Wind baffles and hail guards for field installation by installing contractor


PART 3 - EXECUTION

3.01 INSTALLATION

A. Install in strict accordance with manufacturer’s requirements, shop

drawings, and contract documents.

B. Adjust and level chiller in alignment on supports.

C. Coordinate electrical installation with electrical contractor.

D. Coordinate controls with control contractor.

E. Provide all appurtenances required to insure a fully operational and

functional chiller.

3.02 START-UP

A. Ensure proper charge of refrigerant and oil.

B. Provide Authorized Factory starting of chillers, and instruction to the Owner

on proper operation and maintenance.


Post Office Box 2510, Staunton, Virginia 24402 (540) 248-0711 www.mcquay.com

Documents

Air-Cooled Rotary Screw Chillers